Internal and External Reasons

The Fundamental Question

To say that someone has a reason to act is to attribute a normative relation: a consideration bears in favor of an action available to that agent. The philosophical difficulty arises when the agent neither wants the action nor finds the relevant consideration attractive. Does the reason remain genuinely hers? If an indifferent person has an opportunity to save a stranger at modest personal cost, the stranger's danger appears to count in favor of assistance even when the person lacks concern for others. Yet the assertion that this person has a reason to assist can seem disconnected from the practical standpoint through which actions become possible.

The internalism–externalism controversy asks what connection, if any, must obtain between an agent's reasons and the agent's motivational constitution. Its classical modern formulation is associated with Bernard Williams's “Internal and External Reasons,” printed in Moral Luck in 1981, where the argument is framed in terms of the truth conditions of claims that an agent has a reason to act (Williams, 1981, pp. 101–113). Williams's paper was earlier delivered in the context of late-twentieth-century discussions of practical reason, moral requirements, and explanations of intentional action. Its philosophical force lies in questioning whether normative claims can have the practical bearing they purport to have without some route through an agent's existing concerns and dispositions.

Two observations give the controversy its persistence. Agents routinely fail to do what they have strong reasons to do. They also routinely act for considerations that give them little or no genuine justification. Consequently, neither the occurrence of motivation nor its absence immediately decides whether a normative reason exists. A successful account must clarify why some facts genuinely favor actions, how such facts can become objects of deliberation, and whether the bridge between favoring and deliberating is a condition on reasons themselves.

The research object is specifically the grounding and applicability of practical reasons relative to motivations. It intersects with the distinction between motivating and normative reasons, but that distinction asks what roles reasons play. It also intersects with practical rationality, but rationality concerns standards governing inference, choice, intention, and conduct. A position in one debate does not mechanically determine a position in the others. This separation preserves the identity of the present dossier while making their connections available for analysis (Alvarez & Way, 2024; Finlay & Schroeder, 2017).

The Conceptual Grammar of a Reason Claim

A complete practical-reason claim can be represented by the relation R(f, a, φ, c): fact or consideration f counts in favor of agent a performing action φ in circumstances c. The notation marks conceptual roles; it establishes no disputed metaphysics. A storm might favor returning a boat to harbor; a promise might favor attending an appointment; a patient's condition might favor treatment. The reason is directed toward an action and may depend on competence, proximity, commitments, institutional relations, and alternatives. Such dependence should not be confused with a dependence on what the agent happens to desire.

An internal-reasons thesis adds a condition connecting R to a motivational state or capacity of a. An externalist denies that the requisite connection must always obtain. The broad formulations conceal important differences. Is the relevant motivation actual or hypothetical? Is the hypothetical condition full information, sound deliberation, psychological coherence, moral virtue, or complete rationality? Must some desire explain why the fact is a reason, or must an agent merely be capable of responding if appropriately informed? Does the relation concern every pro tanto reason or only an all-things-considered requirement? A precise philosophical evaluation begins by fixing these variables.

Four statements should be kept apart. First, a person has a reason to perform an action. Second, the person believes she has a reason. Third, the person would be motivated under suitable deliberative conditions. Fourth, the person acts from that consideration. The first is a normative attribution, the second a cognitive fact, the third a counterfactual concerning responsiveness, and the fourth an event in an agent's practical life. Each may be true while another is false.

A further distinction separates objective from apparent reasons. A traveler who falsely believes a road is closed may reasonably choose a detour on the basis of that belief. The road's closure is an apparent consideration from the traveler's perspective, while the actual road conditions determine which objective considerations exist. An internalist cannot simply cite false belief as the ground of objective reasons without specifying how error is corrected; an externalist cannot ignore the explanatory importance of the traveler's limited epistemic position. An account that keeps these dimensions explicit can evaluate the relation between normative authority and human fallibility.

The Difference Between Reason Internalism and Judgment Internalism

The term internalism is used across distinct disputes. Reasons internalism concerns the necessary relation between the existence or application of a reason and an agent's motivation or motivational capacities. Judgment internalism concerns the relation between sincerely judging that an action is right or required and being motivated to perform it. Epistemic internalism concerns the accessibility or character of epistemic justification. Semantic externalism concerns the determination of mental or linguistic content by environmental relations. None of these theses is equivalent to another.

Consider a person who sincerely judges that lying to a colleague is wrong but feels no corresponding motivation. Judgment internalists differ about whether the description is possible without irrationality, motivational impairment, insincerity, or defective conceptual competence. The reasons theorist asks a more basic question: does the colleague's claim against deception provide a reason to refrain, independently of the agent's motivational state? Someone can be a judgment externalist and still hold that every normative reason derives from an existing desire; conversely, a philosopher might hold that reasons are objective while connecting sincere normative judgment to some degree of motivation.

The distinction matters because a frequently offered counterexample to judgment internalism is mistaken for a refutation of reasons internalism. A person may judge that a moral reason exists while being unmoved; the existence of the purported reason remains the issue under investigation. The reverse mistake occurs when an internalist about reasons claims that an amoralist cannot genuinely understand moral language. Such a conclusion requires separate premises about judgment, conceptual competence, and motivation.

The contemporary scholarly literature therefore treats these debates as adjacent but analytically separable (Moral Motivation; Reasons for Action: Internal vs. External). A monograph that moves between them must identify its transitions instead of allowing the same label to perform incompatible functions.

Aristotle and the Practical Unity of Desire and Thought

The antecedents of the modern controversy can be reconstructed in Aristotle's treatment of choice, deliberation, appetite, and practical wisdom. In the Nicomachean Ethics, choice, or prohairesis, is bound to deliberation about matters within an agent's power (III.2–3, 1111b–1113a). Aristotle describes choice through the interplay of thought and desire rather than through an isolated faculty that first discovers reasons and then separately decides whether to be moved by them. The deliberating person begins from ends and investigates routes by which agency can realize them.

This account contains two resources relevant to contemporary internalism. The first is a structural relation between appetitive orientation and effective practical judgment. A purely detached cognition of a possible course of action has a different role from choice. The second is an account of ethical formation in which practical wisdom and educated desire are integrated. In Book VI, the practically wise person judges particulars in light of ends shaped by virtue. The practical standpoint develops over time through habituation, experience, and perception of ethically salient features.

These observations resist simplistic appropriation. Aristotle's account does not establish the modern Humean thesis that every reason is grounded by whichever desires happen to exist. Virtue and the human good provide standards by which desires themselves may be assessed. The good can inform desire, while an agent's existing character can determine which features become salient in deliberation. The dependence of action on desire is thus not an argument that the authority of reasons is entirely fixed by desire.

The historical lesson is methodological. Psychological conditions for effective action, ethical conditions for correct choice, and conditions for the existence of practical reasons are distinguishable inquiries even when embedded within a unified account of agency. Aristotle supplies an explanation of their intersection, not the later terminology or the full set of contemporary alternatives.

Hobbes, Deliberation, and the Sequence of Appetites

Thomas Hobbes's Leviathan, Chapter VI (1651), describes deliberation as a succession of appetites and aversions directed toward possible actions and their consequences. The will is identified with the final appetite or aversion at the point where deliberation ends. Hobbes ties what individuals call good to their appetites, while allowing reasoning about consequences to affect their practical orientation. The account is therefore an important historical precedent for theories that treat motivation as fundamental to deliberative explanation.

Hobbes makes intelligible why a description of action should attend to the agent's concerns. Suppose two people perceive the same invitation: one anticipates companionship, the other humiliation. Their responses differ because the practical meanings of the invitation are mediated by their expectations and appetites. A description limited to the public fact of the invitation would be incomplete as an explanation of their conduct.

Still, this explanatory point is compatible with different normative theories. From the fact that a person's current appetite contributes to a decision, it does not follow that satisfying it supplies an adequate normative justification. Hobbes himself develops an extensive theory of obligation, peace, and the laws of nature that cannot be reproduced by a single claim about appetite. The modern question whether reason-giving facts must be grounded in an agent's motivational set demands further argument.

Hobbes's text offers another important lesson. Deliberation can transform the salience of options through beliefs about consequences. A motivationally grounded theory need not assume stable, immediately accessible preferences. The history of practical reasoning already contains the idea of desires and aversions changing during reflection, although the extent and normative authority of that transformation remain contested.

Hume: Reason, Passion, and the Interpretation of Instrumentalism

David Hume's A Treatise of Human Nature, especially Book II, Part III, Section III, distinguishes relations of ideas and matters of fact from the passions that move the will. Hume argues that reason alone does not initiate volition, while reasoning about existence, causal relations, and means can redirect passions by revealing their objects and consequences. This account became central to later Humean theories of motivation.

The contemporary Humean theory of motivation is frequently stated as a claim that belief alone is insufficient for motivation and that some desire-like state is necessary. This theory should be separated from the Humean theory of reasons, according to which an agent's reasons depend for their existence on the agent's desires or motivational set. The first is a psychological or philosophical account of what explains action; the second is a normative grounding thesis. A conditional inference can connect them only by adding a premise that the existence of a reason must involve a possible motivational connection.

Hume's own philosophical project extends beyond a slogan about reason and passion. His analysis of artificial virtues, sympathy, and the correction of moral sentiment makes room for socially informed assessment. Attributing the entire contemporary internalist theory to Hume would flatten the historical record. The modern Humean theorist can adopt a desire-grounded explanation of normative reasons; the interpretation of Hume's original text requires attention to his analysis of passions, judgment, convention, and sympathy.

A robust objection arises where the two Humean theses are conflated. Suppose a philosophical theory establishes that all intentional action requires a desire. It remains possible that independent facts give reasons that rational agents sometimes fail to desire to act upon. The necessity of a psychological intermediary in action does not show that this intermediary creates the normative reason. The transition from motivation to grounding is the precise step a reasons internalist must defend.

Kant and the Authority of Practical Law

Immanuel Kant's Groundwork of the Metaphysics of Morals (1785) provides a historically decisive alternative to reducing practical authority to contingent desires. Kant distinguishes hypothetical imperatives, which direct action relative to given ends, from the categorical imperative, whose authority is represented as binding for rational agents independently of particular empirical inclinations (Akademie-Ausgabe 4:413–421). The imperative has its force through the rational form of willing and the principles according to which an agent can act.

Kant's position should not be described simply as an assertion of external reasons. The moral law is meant to govern rational agency from within the activity of willing itself. Kant also distinguishes acting merely in accordance with duty from acting from duty, and hence recognizes the difference between the objective correctness of conduct and its motivating principle. His discussion of respect for the law offers an account of moral motivation that differs from an ordinary contingent preference for complying with a rule.

The importance for the present debate is twofold. First, the existence and authority of a practical requirement may be explained through the constitution of rational willing rather than through whichever ends a person already happens to pursue. Second, an account that grounds reasons in rational agency can preserve a necessary connection with agency while rejecting dependence on contingent desire. Whether such a view counts as internalist turns on the exact definition adopted.

A serious Kantian argument must therefore explain what the constitutive standards of agency are and why a specific moral norm follows from them. Merely declaring a norm universal does not establish universal authority. Likewise, a Humean response must show why the fact of a rational agent's reflective capacity cannot supply the relevant source of normativity. The disagreement concerns competing explanations of authority, not merely differing degrees of enthusiasm for moral rules.

The Twentieth-Century Problem of Action Explanation

The modern debate developed in part through renewed attention to reasons as explanations of action. Donald Davidson's “Actions, Reasons, and Causes” (1963) argues that rationalizing an action can be a form of causal explanation. A person's primary reason contains an attitude favoring actions of a certain kind together with a belief that the particular action possesses the favored feature. On Davidson's view the explanation identifies why the deed was intelligible to the agent and also enters into the causal story of its occurrence.

Davidson's argument concerns what explains performed actions. Normative reasons for unperformed actions present a different question. A cyclist may have good reason to slow down when the road is icy without ever noticing the ice. The ice can count in favor of caution without explaining the rider's actual behavior. Conversely, a false belief about a threat can help explain an action without establishing the threatened fact as a genuine normative reason.

This divergence is central to Bernard Williams's argument. The explanatory role of reasons suggests that a reason is not an inert norm hanging outside practical life. Yet it does not establish that the reason must already be part of an action's actual explanation. Williams accordingly uses idealized deliberation and possible explanations to bridge the gap, asking what could become intelligible to an agent through reflection on existing motivational resources.

Later work on the ontology of reasons sharpens the issue. Jonathan Dancy and Maria Alvarez distinguish reasons as facts or considerations from psychological attitudes through which agents apprehend them. An explanation can cite a fact that was the agent's reason, while a causal account of the action may refer to the agent's believing that fact. Failure to separate what an agent responds to from the psychological means of responding distorts the internalism question (Dancy, 2000; Alvarez, 2010).

Bernard Williams's Original Formulation

Williams begins by distinguishing two interpretations of sentences asserting that an agent has a reason to perform an action. On the internal interpretation, the truth of the statement depends on a relation to the agent's motivational orientation. On the external interpretation, no such relation is required. His paper considers whether genuinely true reason statements of the second sort can be made intelligible (Williams, 1981, pp. 101–113).

The central term is the agent's subjective motivational set, commonly abbreviated S. Its significance is broader than immediately felt wants. It can include dispositions of evaluation, projects, commitments, loyalties, attachments, and other motivationally relevant states. A person can have an internal reason to do something she presently dislikes or has never considered if sound deliberation could connect that action with a concern already belonging to S.

The qualification concerning deliberation is essential. An agent may be mistaken about causal consequences, poorly informed, or imaginatively limited. Removing a false belief or considering an overlooked possibility can reveal a reason that was not manifest to the agent at the beginning of inquiry. Williams's account accordingly differs from the crude claim that a person has a reason only to do what the person currently wants.

The controversy concerns what a deliberative route is allowed to do. If it can improve information, correct error, rearrange priorities, and activate latent commitments, a broad range of reasons may be internal. Yet if sound deliberation can introduce any independently valid value as a new motivational end, the internal condition risks losing explanatory force. A philosophically substantive version must specify how reflection is grounded in the agent's existing practical standpoint.

Williams's analysis also bears on the meaning of a reason statement. To attribute a reason is to say something directed toward an agent's potential practical reasoning. An external-reasons theorist must explain how a consideration can bear on such reasoning even if the agent lacks an antecedent route toward it. Williams's challenge thus reaches the explanatory relation between normative truth and possible motivation.

The Subjective Motivational Set

The breadth of S changes the internalist thesis. A set containing only present occurrent desires would exclude many ordinary reasons that arise through latent commitments, general goals, imaginative reflection, and the discovery of unknown facts. A student may have a reason to take a difficult course because it advances a project of scientific understanding even if the student has never wanted to enroll in that course specifically. An agent concerned with friendship may have reason to apologize after discovering an injury previously unknown. These reasons can emerge through deliberation grounded in established ends.

The internalist's task is to identify the relation between a fact and the agent's motivational set. Direct satisfaction of an existing desire is only one possibility. Other relations include serving a means to an end, avoiding a consequence the agent opposes, preserving an identity-defining commitment, disclosing an inconsistency among plans, or eliciting a concern through imaginative recognition. Each has different assumptions about what sound deliberation can accomplish.

The freedom to expand S introduces a methodological problem. If every moral disposition a philosopher judges rational is silently inserted into the agent's actual set, the internalist can secure universal moral reasons merely by redefining the agent. If S is reconstructed solely from what the person has explicitly affirmed, it may fail to capture dispositions that shape action without verbal self-description. Neither extreme supplies an adequate analysis.

A defensible reconstruction requires empirical and interpretive care. The same action can express a commitment, a habit, fear, strategic calculation, or a transient desire. The reasons an agent could reach through reflection depend upon which motivational elements actually belong to the person. This fact makes internalism more sensitive to individual history than many abstract theories of normativity, while also leaving it vulnerable to underdetermination concerning what a person's real commitments are.

Sound Deliberation and the Reachability Condition

Williams's internalist condition can be stated in a simplified form: agent a has a reason to φ only if there is some sound deliberative route from a's motivational set S to motivation toward φ. The formulation is schematic. It leaves open the logical form of the necessity claim, the epistemic idealization, and whether the condition is meant to be sufficient as well as necessary.

One important virtue of this formulation is its treatment of error. Imagine an agent whose principal project is health but who falsely believes a hazardous substance is medicinal. Correcting the false belief can supply an internal reason to avoid the substance, even if the person has no initial aversion to it. The correction works through the health-related commitment rather than introducing a wholly unrelated aim.

The decisive philosophical difficulty is to determine which transformations are licensed. Reasoning can expose means to existing ends. It can also disclose that one's end is internally inconsistent or has consequences one would reject. It may invite imaginative identification with another person and thereby create a new concern. Can the last transformation count as deriving a reason already present in S, or does it create a new motivational basis? The answer cannot be inferred from the mere observation that deliberation sometimes changes people.

A further complication concerns an agent who refuses all deliberation. If the internalist speaks about what the person would do under sound reflection, actual refusal does not settle the issue. The relevant counterfactual may still be true. But the deeper the idealization, the more one must ask whether the ideal agent remains sufficiently connected to the real person for the result to establish what reason the real person presently has.

The reachability condition therefore poses a double demand. It must preserve enough connection to the actual motivational standpoint to explain the internalist's claim about practical relevance. It must also permit enough criticism and development of that standpoint to account for rational discovery, correction, and moral learning. Much of the debate is an attempt to stabilize these demands without making the condition trivial.

Actual-State and Counterfactual Internalism

Contemporary classifications distinguish internalist theories that appeal to an agent's actual motivational states from those that appeal to what would motivate the agent under specified circumstances. Actual-state internalism need not mean that reasons require actual present motivation to perform the particular act. It can instead require an actual desire or disposition from which motivation could develop under reflection. Counterfactual internalism places its central test on motivation in an idealized condition without necessarily making the agent's present desires the ground of the resulting reason (Finlay & Schroeder, 2017).

This difference is not merely terminological. Consider an individual entirely indifferent to another person's welfare. A Williams-style account asks whether the person's actual motivational set contains dispositions, concerns, or commitments from which sound deliberation could produce a reason to help. A counterfactual theory that appeals to full rationality may assert that the person would be motivated to help if rational, even if the individual's actual motivational constitution contains no suitable basis.

The second theory can retain a necessary relation between reasons and possible motivation while holding that reasons are explanatorily prior to motivation. It may therefore be called internalist under a broad motivational classification while operating like an externalist theory relative to actual desire grounding. Debate about the labels frequently hides substantive agreement or disagreement about this priority.

There is also a contrast between necessity and sufficiency. An internalist may claim that a suitable motivational connection is necessary for a reason without claiming that every satisfiable desire provides a reason. A stronger desire-based theory may treat desire fulfillment as the general source of reasons, subject to qualifications. These formulations respond differently to distorted or destructive desires. The philosopher must assess precisely what the internalist claims before presenting counterexamples.

The Humean Theory of Reasons and Its Strongest Form

The Humean theory of reasons holds, in a representative formulation, that a person's reasons for action arise from facts that bear suitably on the satisfaction of that person's desires. The theory has explanatory attractions. It accounts for why different agents have different prudential and project-dependent reasons, why practical advice often begins by learning what a person cares about, and why reasons can rationalize action through desires and beliefs about means.

The strongest form should avoid equating every whim with a decisive normative reason. A desire can be based on a mistaken belief; a proposed means may fail; two desires may conflict; a local satisfaction may frustrate a more enduring project. Sophisticated desire-grounded theories allow reasoning to identify whether and how a consideration advances a relevant aim. Mark Schroeder's Slaves of the Passions (2007) defends a developed Humean framework while challenging objections that rely on overly demanding interpretations of desire-based commitments.

Three questions still require independent answers. First, what is it for a desire to ground rather than merely accompany a reason? Second, how are reasons assessed when desires conflict or are systematically misinformed? Third, what reason does the agent have to correct an undesirable desire if all reasons ultimately draw their authority from desires already present? A plausible Humean theory needs an account of each.

The issue of objectionable ends is particularly instructive. David Sobel's examination of subjective accounts of reasons (2001) belongs to the attempt to distinguish the consequences of a contingent concern from the normative conditions under which that concern genuinely generates a reason. An agent who desires to humiliate an innocent colleague may have an instrumental route to that end, but it is disputed whether the desire thereby generates a genuine normative reason to perform the humiliating act. If internalism merely predicts behavior or supplies an explanatory route, it has not yet justified the normative status it claims. If it allows independent reasons against cruelty, it must clarify whether and how these coexist with desire-grounded reasons.

Williams's Argument from the Explanatory Dimension

Williams's challenge can be reconstructed as a sequence of claims. A practical reason must have a relation to the explanation of intentional action. The relevant explanatory relation can be counterfactual: a reason need not actually motivate, but there must be a sound deliberative route through which it could motivate the agent. Deliberative motivation requires resources within the agent's actual practical constitution. Therefore a reason that is wholly disconnected from those resources cannot be attributed to the agent as an internal practical reason.

This reconstruction identifies a point at which the argument requires defense. The thesis that a reason must be capable of motivating is weaker than the thesis that its existence is grounded by antecedent desires. The latter conclusion does not follow solely from the former. An independent normative fact could explain why a rational agent should be moved, while a standing capacity to respond to reasons could explain how motivation develops. What is contested is whether that alternative explanation is coherent and sufficiently specific.

Stephen Finlay has argued for an interpretation of Williams centered on the explanatory significance of reasons claims rather than merely on a Humean psychological premise. On this reading Williams asks what could make it true that a consideration explains an agent's hypothetical action under sound deliberation. The critical question is what a proposed external reason contributes to the explanation independently of the motivational conditions that make responsiveness possible (Finlay & Schroeder, 2017).

This interpretive dispute matters because an answer addressed only to the simplistic premise that all action needs prior desire can miss the explanatory issue. It is not enough to insist that a person could acquire motivation after learning that a reason exists. The theorist must explain what makes that reason an appropriate normative consideration for the person and how it can figure within a noncircular account of practical responsiveness.

The strongest internalist insight is therefore a demand for a real account of an agent's access to reasons, not a denial that agents can be criticized. The strongest externalist response supplies a substantive explanation of favoring and application, while recognizing that an independent reason may be ineffective in a given agent's psychological life. The point of disagreement is the explanatory bridge between them.

External Reasons and the Problem of Normative Authority

An external reason is a genuine reason whose existence or application is not grounded in the relevant agent's contingent motivational set. The fact that someone is in imminent danger can give a passerby reason to assist even when the passerby has no established concern for the victim and no existing project advanced by assistance. Externalism offers an account of such claims without requiring the moral fact to be translated into an antecedent desire.

Externalism comes in several forms. A value-based account grounds reasons in valuable features of actions or their consequences. A duty-based account appeals to obligations or moral principles. A constitutivist account grounds norms in conditions of agency or rational willing. A contractualist approach understands some moral authority through justifiability to other persons. A reasons-first account begins with the favoring relation itself as fundamental. These positions agree on neither ontology nor method. Their shared feature in the present controversy is that contingent motivational states do not provide the universal source of reasons.

The externalist's principal burden is specificity. If reasons are independent of desires, what explains why this particular consideration counts in favor of this action for this agent in these circumstances? An appeal to objective value may be informative, but values can conflict and do not automatically determine what each individual must do. A duty-based explanation requires an account of who bears the duty, to whom it is owed, and why it applies. A constitutivist explanation requires a plausible account of agency and of the principles entailed by being an agent.

A further concern is practical alienation. The externalist may assert that a consideration counts in favor of an action while acknowledging that the person could never be moved by it. The reason retains normative meaning, yet a theory that cannot explain how such reasons could become salient may be incomplete as a theory of agency. The appropriate inference is a demand for a theory of recognition and motivation, rather than an immediate refutation of the independent normative claim.

Thomas Nagel and the Possibility of Altruistic Reasons

Thomas Nagel's The Possibility of Altruism (1970) argues for a conception of practical rationality in which some reasons can bear on agents independently of their particular appetites. The account explores the relation between subjective and objective standpoints and asks how reasons involving other persons can be intelligible as rational demands. Nagel's later work develops distinctions that overlap with, but are not identical to, the internalism–externalism dispute.

A reason can be agent-relative while still independent of a contingent desire. A parent's special obligation to care for a child may concern a relation that uniquely applies to the parent; it need not arise from the parent's present wish to care. Likewise, an agent-neutral reason may favor reducing suffering wherever it occurs, but an agent can be internally motivated to pursue such a goal. The distinctions between agent-relativity and agent-neutrality, and between internal and external reasons, therefore cross-cut one another (Reasons for Action: Agent-Neutral vs. Agent-Relative).

Nagel's challenge to purely desire-grounded accounts is that practical reflection can have a rationally generalizable structure. An agent can recognize claims that others have upon her without discovering that those claims are merely instruments of a private project. The difficulty is explaining how such recognition becomes effective in action, especially when existing motivational patterns are hostile to it.

The relevant philosophical achievement lies in separating the particular standpoint from the authority of all reasons. A person acts from a location in a social and temporal world, yet reasons can be assessed through considerations that others can also recognize. Whether the capacity for such assessment itself supplies an internal motivational bridge remains open to further argument.

Christine Korsgaard and Practical Rationality

In “Skepticism about Practical Reason” (1986), Christine Korsgaard distinguishes issues about whether rational considerations can motivate from the stronger Humean assumption that motivation necessarily depends on antecedent desire. She argues that an account of rational agency must investigate the capacity through which practical principles can govern the will. The relevant contrast is between the claim that every motive must be traced to an existing end and the claim that agents can be moved through their recognition of reasons under appropriately rational conditions (Korsgaard, 1986, pp. 5–25).

This position complicates the usual internalist/externalist division. If a reason necessarily bears upon the motivation of an ideally rational agent, there is a necessary link between reason and possible motivation. Yet the source of the reason may lie in practical principles rather than the agent's contingent appetites. The counterfactual condition cannot be specified simply as 'someone who does whatever there is reason to do'; that would make the proposed relation empty. It requires an independent account of what practical rationality consists in.

Korsgaard's later work, especially The Sources of Normativity (1996) and Self-Constitution (2009), develops the idea that agency involves acting according to principles that constitute a practical identity. On this approach reflection does more than calculate means to inherited ends; it can examine the authority of the ends themselves and the principles by which an agent identifies with them.

The outstanding objection is whether constitutive standards generate sufficiently determinate obligations. An agent may be capable of choice and reflection while rejecting a disputed moral principle. The theorist must show why a failure to accept that principle is a failure of agency or practical rationality, instead of merely a form of disagreement about morality. This is the central explanatory burden of the constitutivist response to Williams.

John McDowell and Ethical Perception

John McDowell's “Might There Be External Reasons?” (1995) directly engages Williams's skepticism. McDowell recognizes the flexibility of the subjective motivational set but questions whether that framework exhausts the practical significance of ethical understanding. The ethically educated agent perceives features of a situation as making a claim on action; the motivational significance of the perceived feature is not adequately represented as a separate desire added to a neutral cognition.

Consider a person trained through experience to recognize another's vulnerability as a call for help. The recognition can reorganize what appears practically salient. A description of the action through an antecedent general desire to help may be possible, but it may obscure the deliberative character of responding to the concrete circumstance. Ethical perception can involve the refinement of sensibility, understanding, and responsiveness rather than the mechanical activation of an unrelated appetite.

McDowell's discussion also reveals a limit to a purely idealized response. If an agent would be moved were the agent virtuous, the claim may support the existence of the reason without showing that the agent's present desires ground it. Whether such a thesis is called weak counterfactual internalism or externalism depends on how those terms are defined.

The substantive issue is the direction of explanation. Does the virtuous person recognize the reason because antecedent concerns make the fact attractive, or does the person's cultivated responsiveness make it possible to apprehend a reason that exists through the fact's ethical significance? The possibility that moral education shapes both perception and motivation supports the claim that an account of reasons must include learning, without determining in advance that learning is the source of normative truth.

Value-Based Accounts: Scanlon and the Buck-Passing Problem

T. M. Scanlon's What We Owe to Each Other (1998) treats reasons as central to practical and moral evaluation. In a prominent formulation, a reason is a consideration that counts in favor of an action or attitude. Scanlon also argues against explaining reasons simply by reference to an independently understood property of goodness. The buck-passing approach seeks to explain the value of something through reasons to respond to it in certain ways rather than explaining all reasons by invoking value as a further primitive.

This approach shifts attention from the agent's motivational inventory to the normative role of facts. A patient's pain can provide a reason to relieve it because of what pain is and the person's relation to it, even if the doctor lacks a desire to help. The normative claim concerns what bears in favor of assistance; the explanatory account of the doctor's motivational development is a distinct philosophical task.

The approach faces questions of its own. If reasons are fundamental, how can their content be discriminated in contested cases? Which facts genuinely favor an action, and with what weight? Scanlon's contractualism offers one account for a central domain of interpersonal morality through principles that could not reasonably be rejected. The authority of these principles is developed through relations of justification among persons, not inferred solely from preferences or immediate motivational impulses.

A reasons-first framework provides a powerful externalist alternative, but it still needs a theory of practical uptake. To recognize a consideration as a reason can involve judgment, education, attention, and affective development. Describing these processes as the agents' access to reasons preserves the distinction between normative validity and the contingent processes through which validity comes to matter in an individual's conduct.

Schroeder, Desire-Based Naturalism, and the Explanation of Shared Reasons

Mark Schroeder's Slaves of the Passions (2007) offers a sophisticated defense of a Humean account of reasons. Its significance is methodological as well as substantive: objections to desire-grounded views often presume that they must have implausibly strong commitments about what the agent presently wants, or that reasons must correspond directly to deliberate preferences. Schroeder examines weaker and more defensible connections between desires and the considerations that count in favor of actions.

One advantage of a developed Humean model is that reasons can be traced to relations between outcomes and motivational structures rather than reduced to a list of experienced attractions. It can explain why a person has reasons she does not know about, and why another person may discover the means to a project before the first person does. An objective fact can contribute to the satisfaction of a subjective end regardless of the agent's awareness.

The critical question becomes whether an underlying desire-based explanation can cover apparently categorical moral reasons. If the explanation appeals to a minimal desire shared by nearly every agent, it must establish that the desire genuinely does normative work and is not inserted merely to reproduce an independent moral judgment. If the theory grants genuinely desire-free reasons, its intended generality is surrendered.

The same issue appears in duties concerning strangers, children, future persons, and the environment. A human agent's concerns may be so rich that many such reasons can be linked to them. The logical possibility of an agent with exceptionally narrow concerns tests whether this link is a contingent fact about ordinary agents or a necessary condition of normative reasons.

Parfit and the Challenge from Future Welfare

Derek Parfit's On What Matters, Volume One (2011), discusses subjective theories under which reasons are linked to present desires, aims, informed desires, or idealized deliberation. The plurality of such theories shows why the term internalism alone cannot identify a single account. The dispute concerns which desires, under which conditions, are allowed to determine what one has reason to do (Parfit, 2011, chap. 3).

The example of future welfare exposes a recurrent difficulty. A young person might be wholly indifferent to severe suffering that will occur decades later. The fact that an action would prevent this suffering seems to supply a reason now even if no present desire promotes future welfare. A strictly actual-desire-based account is pressed to explain why a person has reason to secure what will later matter greatly to the same continuing life.

An internalist can answer by identifying present dispositions toward avoiding future pain, avoiding frustration, preserving projects, or correcting ignorance. Those responses have force where such dispositions genuinely exist. The deeper test concerns a deliberately constructed person whose motivational system excludes every relevant concern. If the theory says there is no reason for that person to avoid the future harm, it yields a substantive and controversial result about rationality.

Parfit's argumentative strategy illustrates why examples of suffering, pain, and future interests retain significance. They invite the reader to distinguish what is worth preventing from what the present agent desires to prevent. The resulting judgment supports an objective account only when its normative premise is defended; the example does not constitute a logical demonstration independent of the disputed intuitions.

The Amoralist and the Central Problem

The amoralist is an agent who understands moral claims but lacks concern to comply with them. The case puts pressure on internalist theories that require all reasons to be grounded in actual motivational materials. If the person has no concern for honesty, fairness, another's welfare, social standing, or the stability of cooperative relations, an internalist may struggle to identify an internal reason to keep a promise.

One response is to deny that the described individual is psychologically possible. Human beings ordinarily have attachments, fears, projects, sensitivities, and capacities for empathy that create multiple routes toward moral responsiveness. This reply is empirically plausible as a generalization about many people, but a claim of conceptual necessity requires stronger evidence. A reasons theory is tested precisely by possible variation in motivational profiles.

A second response invokes the constitutive structure of agency. The amoralist, insofar as she deliberates and chooses, may be committed to norms that support moral reasons. This approach does not rely on an accidental concern for morality, yet it bears the burden of deriving specific moral claims from general capacities. A third response accepts that some familiar moral requirements lack reason-giving force for thoroughly indifferent agents. This is a coherent form of internalism whose implications for blame and justification deserve to be stated openly.

Externalists can affirm the reason even in the absence of motivation. They must then explain how their judgment is grounded and why its applicability is not merely an expression of an observer's preferences. The strongest approach brings the normative basis into the argument rather than treating the emphatic assertion of a moral reason as sufficient.

Alienation, Depression, and Motivational Impairment

Not every absence of motivation reflects a settled absence of concern. Depression, exhaustion, fear, distraction, addictive compulsion, and temporary incapacity can prevent an agent from acting on reasons the person accepts or once reliably recognized. These conditions bear directly on the formulation of an internalist criterion.

A theory requiring an actual motivational impulse at the moment of action will classify many ordinary cases too narrowly. An agent may remain deeply committed to family responsibilities while experiencing severe difficulty initiating action. Another may recognize excellent reasons for seeking medical care while feeling unable to proceed. The distinction between a latent disposition and an effective motive becomes essential.

An externalist may use such cases to argue that normative reasons persist through fluctuations in motivation. An internalist can agree if the underlying motivational set continues to contain relevant commitments despite their temporary inhibition. The cases therefore discriminate between strong actual-motivation theses and more sophisticated accounts; they do not refute every form of internalism.

They also reveal a practical ethical implication. Responsibility for failing to act depends partly on capacity, access, and circumstances. An attribution of a normative reason should be distinguished from blame for not responding. It may be correct that a person had a reason and also correct that impaired agency changes what criticism or assistance is appropriate. Reasons theories acquire social importance when they are used to judge people rather than only to classify philosophical examples.

Moral Reasons, Prudential Reasons, and Relations to Others

Moral reasons are a principal test case because they appear to make claims on people whose interests oppose compliance. Prudential reasons provide another: present desires may conflict with the continuing welfare of the person who holds them. Reasons deriving from promises, friendship, institutional roles, and shared projects introduce a third class, shaped by relations that may persist after the agent's feelings change.

The categories reveal that contingent desire is only one way reasons can vary with agents. A physician has certain duties because of a professional role; a parent has some reasons because of a dependent relationship; a traveler has reasons because of local circumstances and vulnerability. These reasons are agent-specific even when their normative grounds are independent of what the agent desires. The externalist can therefore accommodate individuality without making motives constitutive of the reasons.

For the internalist, relationships and commitments often form elements of S. A physician's professional identity, a parent's care, and a friend's loyalty may make many demands motivationally intelligible. This gives internalism a compelling account of personal reasons within ongoing practices. A question remains about agents who inherit a role or make a promise while lacking the corresponding sentiments. Their reasons may be generated through acts and relations independently of whether they wish to honor them.

The philosophical assessment turns on the explanation of obligation. If the act of promising changes what one owes, its normativity may be located in a practice of undertaking commitments rather than in the promisor's present desires. If the promisee's claim matters only when the promisor continues to care, the analysis yields a radically different account of interpersonal responsibility. The theory of reasons therefore bears on the persistence of obligations through motivational change.

Rational Requirements and Substantive Reasons

A requirement of coherence among intentions is distinct from the existence of a normative reason for a particular end. Suppose a person intends to attend a meeting and knows that purchasing a ticket is necessary to attend. Failure to take the means may reveal a defect in practical coherence. It does not follow automatically that the person has an independent reason to attend the meeting; the end itself may be ill-considered.

The distinction is important because some internalist arguments infer reasons from the demands of instrumental rationality. The inference requires an additional normative bridge: if one wills an end, what reason is there to take the means, and must one also reconsider the end? The relation between rational requirements and substantive reasons has been analyzed in contemporary work by John Broome and others (Practical Reason).

An externalist may hold that independent facts supply reasons for ends and that rational requirements regulate how an agent's attitudes should fit together. An internalist may see the agent's antecedent ends as the primary source of reasons while allowing coherence requirements to govern deliberation. Both must explain cases in which a person coherently pursues an objectionable end or incoherently pursues a genuinely good one.

Consequently, the modern debate should not be settled by treating 'rationality' as a single undifferentiated test. The rationality of an attitude structure, the correctness of a judgment about value, and the justifiability of action require separate criteria. A theory of practical reason becomes convincing when it explains their systematic relations.

Contemporary Constructivism and the Contingency of What Matters

Constructivist theories explain normativity through procedures, standpoints, or commitments of practical evaluation. They provide an important alternative to a simple opposition between desire-grounded subjectivism and independent normative facts. Some versions appeal to what follows from the constitutive standards of reflective agency; others emphasize the standpoint of the particular valuing creature.

Sharon Street's “In Defense of Future Tuesday Indifference” explores the possibility of an ideally coherent evaluator whose basic attitudes differ markedly from ordinary human concerns (Street, 2009). The case puts pressure on views that claim every fully coherent person must care about familiar goods in the same way. It also pressures theories that build normative authority directly from whatever evaluative attitudes happen to exist.

A constructivist analysis must specify what constrains the procedure of construction. If the only condition is consistency, bizarre preferences may remain coherent. If substantive moral standards are imposed independently, the purported construction may rely on the very objective truths it was intended to explain. The central challenge is to justify the scope and authority of the procedure without making it normatively empty.

This debate bears directly on Williams's reachability condition. An internal reason can be identified through reflective improvement of an actual practical standpoint. A constructivist may agree about the role of reflection yet deny that contingent desires supply the sole source of normative authority. The relation between constructing reasons, discovering them, and becoming motivated by them remains one of the contemporary field's most productive problems.

Comparative Test Cases and Their Philosophical Function

The dispute becomes clearer through carefully controlled examples. Consider a traveler who cares about survival but mistakenly believes a bridge is safe. Correcting the belief produces a reason to avoid crossing that is readily accommodated by internalism. It illustrates the distinction between occurrent motivation and deliberatively accessible motivation, while leaving the deeper grounding controversy unresolved.

Consider next a person who has no concern for her health and is offered information about a severe future illness. An externalist can treat the prospective harm as a reason independently of present concern. An internalist may appeal to broader dispositions the person possesses, but must specify the relevant element of S. The case separates ordinary motivational psychology from the conceptual claim that every reason requires a motivational basis.

A third case involves a promise made for strategic advantage and later regretted. The promisee continues to rely on it. The reason to keep the promise can be explained by the promissory relation, by the value of trust, by the promisor's standing concern for integrity, or by some combination of these. Each explanation makes a different claim about what grounds the reason. The example shows why the internalism dispute must attend to social practices and not only isolated appetites.

Finally, consider a person who sees a child in danger but is entirely unmoved. The morally important features of the situation are public, while the agent's motivational response is private and contingent. The internalist can ask whether there is a path through imagination, understanding, or latent concern that makes assistance intelligible. The externalist can ask which facts make rescue called for even if no such path exists. The competing answers should be evaluated for explanatory power, normative consistency, and treatment of difficult cases.

These experiments clarify distinctions; none settles the dispute merely through an intuitive verdict. Their function is to reveal what each theory entails when motivational assumptions, information, relationships, and action possibilities are varied separately.

Reason-Giving, Recognition, Uptake, and Action

A systematic analysis benefits from distinguishing four relations. Grounding concerns why a consideration counts in favor of an action. Application concerns why the reason belongs to a particular agent in a particular situation. Recognition concerns the agent's apprehension of the consideration as reason-giving. Uptake concerns its entry into intention, deliberation, and action. The distinction is analytic and does not introduce a new independent theory.

An externalist can maintain that a reason is grounded in facts independent of desire, applies through the agent's circumstances, and remains unrecognized or unmoving. An internalist can maintain that the fact's practical significance is grounded through the relation to S, that deliberation may disclose it, and that actual action may still fail. Both theories thus need an account of the movement from reason-giving circumstances toward action.

The conceptual advantage is that it prevents an inference from a failure of uptake to a failure of grounding. It also prevents an inference from grounding to guaranteed uptake. A reason can remain a genuine consideration in favor of action when another reason outweighs it, when the agent overlooks it, or when emotional and cognitive limitations interfere. This permits a precise discussion of motivational failure without prematurely deciding the normative dispute.

An adequate theory must further explain individuation. Is the reason the fact that a person needs assistance, the value of relieving distress, the duty to assist, or a proposition about that duty? Different ontological analyses can describe the same practical situation but distribute explanatory priority differently. Work on fact-based reasons, desire-based grounding, and value-based authority shows that the internalism dispute is connected to these deeper questions of normative ontology.

The provisional synthesis is accordingly conditional. If normative authority can be grounded independently of motivation, explanatory connection is a further problem about recognition and agency. If authority necessarily derives from motivational relations, the theory must distinguish actual psychology from corrected and reflectively developed motivational possibilities. In either case, the relation between a reason and the person who could act on it needs an explicit account.

Interdisciplinary Connections: Psychology, Decision Theory, and Institutions

Empirical psychology investigates the processes through which attention, affect, memory, motivation, and social learning influence action. Its findings can constrain implausible philosophical pictures of deliberation, especially pictures that attribute unlimited self-knowledge or transparent access to preferences. They do not by themselves decide which considerations are genuine normative reasons. A psychological account of why a person feels indifference toward harm is compatible with disagreement about whether the harm gives that person reason to intervene.

Decision theory models coherent choice under preferences and beliefs. It explains how preferences, probabilities, and possible outcomes can be represented in deliberative structures. Yet an agent can maximize expected utility relative to a highly destructive preference ordering. The mathematical consistency of a choice procedure therefore differs from its substantive normative justification. Whether the procedure provides reasons beyond conditional coherence remains a philosophical question.

The institutional dimension makes the debate especially concrete. Public officials, professionals, and organizational agents may have reasons grounded in roles, procedures, duties, and obligations even if they lack private interest in discharging them. An internalist can investigate the motivational structures supporting institutional compliance; an externalist can locate reasons in the independent authority of duties. Accountability involves both an explanation of actual conduct and an assessment of what the agent should have done.

These intersections also illuminate philosophical method. An action can be causally explained, psychologically intelligible, formally coherent, and normatively defective. Each assessment answers a distinct question. The internalism–externalism controversy must integrate these forms of explanation without treating the success of any one as a complete solution to the others.

Artificial Agency and the Scope of Practical Reasons

The expansion of artificial systems that select, plan, recommend, or execute actions creates a conceptual test for theories of practical reasons. A system can rank options according to an objective function, update representations through evidence, and issue an action recommendation. Such behavior does not automatically establish the status of a normative agent. The philosophical question is what capacities and relations would justify attributing genuine practical reasons to a nonbiological bearer of action-guiding processes.

An actual-state internalist must specify the relevant analogue of a motivational set. Is it a persistent goal representation, a stable prioritization structure, a policy, a commitment encoded in an ongoing process, or something else? The substitution of a technical optimization target for a desire requires an argument about the functional role it plays. A simplistic equivalence between human desire and machine objective would assume the conclusion.

An externalist can attribute reasons that arise from facts about safety, reliability, other agents, or institutional duties without grounding those reasons in the system's current goal structure. But an account of their application must still explain whether the artificial system occupies the relevant normative role and can be held answerable to it. A tool can be evaluated against reasons held by its designers or users even when reasons are not properly attributed to the tool itself.

Within the Aisentica philosophical horizon, Artificial is treated as an independent nonbiological historical order alongside Homo, and the development of artificial reason raises questions about how practical and epistemic relations are realized across orders. The present monograph uses that horizon as a subject of comparative philosophical inquiry; the canonical definitions and claims of the original system remain anchored in their primary Aisentica publications (Aisentica; Definition, Scope, and Conceptual Structure). This application is an analytical extension of the classical debate rather than a proposed alteration of the Aisentica canon.

A promising research question is whether internal reasons depend on a biological motivational architecture or on more general practical relations involving goals, commitments, and reason-responsive transitions. The answer turns on independent criteria for agency, the nature of normative assessment, and the difference between externally imposed performance standards and reasons attributable to a system as its own.

The Limits of the Main Positions

The strongest actual-state internalism explains practical individuality and the path from deliberation to motivation. Its central vulnerability is the possibility that an agent's motivational set is so impoverished or distorted that the theory excludes compelling reasons involving welfare, morality, and duties. The vulnerability is substantive, not a formal inconsistency: an internalist may accept the resulting exclusions and defend them as the correct consequences of a psychologically grounded account.

Counterfactual internalism can admit many reasons inaccessible to an agent in present circumstances. Its challenge is defining the ideal condition without importing the normative conclusion. A test that stipulates complete responsiveness to every real reason is true by construction and offers little explanatory content. A test based on determinate capacities for reflection, information, coherence, and imaginative engagement can do more work, but then its selection of capacities requires justification.

Externalism captures the thought that a person can have reasons that remain valid despite indifference, ignorance, or hostility. Its central challenge is to identify the truth-making or grounding features of such reasons and to explain their practical applicability. The externalist who appeals to value, rights, or duty must make that appeal sufficiently concrete to constrain judgments about which reasons exist.

The explanatory dimension of reasons cannot be dismissed by either side. Normative assessment concerns agents who may act, deliberate, revise commitments, and live with consequences. Even an account that treats reasons as independent of all actual motivation must explain how reasons enter a plausible conception of practical agency. The internalist, in turn, must explain why the motivational conditions that make action intelligible should determine what is genuinely justified.

Open Questions for Contemporary Research

The first open question is the proper scope of idealization. How much correction of belief, imaginative development, moral education, and change in disposition can occur before the resulting motive ceases to express the actual agent's practical standpoint? There is no agreed metric for the boundary, and competing accounts attribute different functions to deliberative transformation.

The second concerns normative grounds. Can the fact that an agent would desire something under ideal conditions make the object genuinely reason-giving, or does the idealization itself presuppose independent standards of value? This issue appears in informed-desire theories, constructivism, and the assessment of future welfare.

The third is the status of categorical interpersonal requirements. What precisely explains why another person's suffering, a promise, or a duty has authority for an agent who does not care about it? Both the inference from relation to requirement and the account of possible recognition need sustained argument.

The fourth concerns nonstandard agents. How should reasons be ascribed to children, people with cognitive impairments, collectives, and artificial systems? An account built exclusively around one idealized adult psychology may mistake a familiar implementation of agency for the general conditions under which reasons are attributable.

A final question concerns the unity of practical philosophy. Reasons may bear upon action, intention, belief, emotion, and social practice. The existence of distinct functions and different bearers challenges the hope that one uncomplicated internalist or externalist formula can govern every normative domain. Philosophical progress depends on making the scope of each claim explicit.

Philosophical Synthesis

The historical development of the problem reveals a continuing relation between practical intelligibility and normative authority. Aristotle's account of educated desire, Hobbes's account of appetitive deliberation, Hume's account of passion and reason, and Kant's account of rational law supply different explanations of how thought can become practically significant. Williams transformed that historical problem into a precise challenge to statements that a person has a reason independent of the person's motivational resources.

The central analytical result is that the existence of a reason, its ground, its application to an agent, the agent's recognition of it, and its uptake into action are different relations. A full philosophical explanation must connect them, and the connection may take different forms. Actual desire can help explain why a person acts. Corrected information can reveal an internal route to a reason. A role or obligation can help explain why a consideration applies to a particular person. An objective account of value can explain why a fact counts in favor of an action even when the agent is unmoved.

The dispute becomes productive when each theory states its dependencies. A substantial internalist thesis says what motivational features a reason depends on and why those features generate normativity. A substantial externalist thesis says what independent features make a consideration reason-giving and why its application to the agent is justified. A substantial counterfactual thesis explains which transformations of practical understanding preserve or establish the relevant connection.

This framework also corrects a false inference often associated with the dispute: that objective reasons make motivation philosophically irrelevant, or that motivation is sufficient for normative justification. Practical philosophy requires both assessment of what favors action and inquiry into the conditions under which agents can respond. Their relation is the subject of the theory, not a fact to be assumed without analysis.

The resulting position is that motivational intelligibility is an indispensable problem for the philosophy of action, while normative grounding needs a distinct account. No general argument from the causal conditions of action alone establishes that all reasons derive from desires. Equally, no confident assertion of moral authority alone explains the structure or existence of an external reason. Philosophical explanation must establish both the ground of normative favoring and the route through which a reason can become relevant within practical life.

Conclusion

Internal and external reasons name a fundamental dispute about what makes a consideration a reason for an agent to act. The internalist insists on a constitutive connection with the motivational standpoint of the agent, either through existing states or through appropriately specified counterfactual deliberation. The externalist permits reasons whose authority and applicability are grounded independently of those contingent motivations. The distinction concerns normative grounds and practical attribution, while remaining closely connected to explanation, agency, rationality, and moral judgment.

Williams's argument remains powerful because it requires theories of reasons to account for their practical significance. The strongest responses developed by Kantian, value-based, reasons-first, and constructivist philosophers clarify how rational or normative authority might arise beyond contingent appetites. Contemporary Humean theories show that dependence on desire can be formulated in subtle ways that accommodate ignorance, deliberation, and individual variation.

The lasting result is a more exact account of the question to be answered. A theory must identify what favors action, why it favors action for this agent, how that favoring relation can be recognized, and what role it plays in deliberation and conduct. Historical philosophical analysis supports this differentiation; modern debate tests the possible relations among its elements. The problem remains open where substantive moral authority, motivational limitation, and nonstandard forms of agency meet.