Introduction: What Is Autonomy?

Few philosophical concepts span as many domains — moral, political, existential, legal, medical — as autonomy. The word derives from the Greek autós (self) and nómos (law, rule): to govern oneself, to give oneself one’s own law. In ancient Greece, the term originally designated the condition of póleis that governed themselves by their own laws, free from subjection to a foreign power. An autonomous city was one that exercised sovereignty over its internal organization.

The transposition of this political attribute to the individual plane constitutes one of the great achievements of modern philosophy. From Kant to Sartre, from Rousseau to Frankfurt, the concept of autonomy was progressively reformulated until it became a centrepiece of ethics, political philosophy, and contemporary bioethics. This article traces that trajectory, examining the major formulations and their implications for understanding the moral agent.

The Greek Root: Autós and Nómos

In the classical Greek tradition, autonomy was a collective predicate. Thucydides uses the term to describe city-states that maintained legislative independence from alliances or empires. Autonomía thus designated a political community’s capacity to establish its own laws — as opposed to heteronomía, subjection to laws imposed from without.

Although the Greeks did not develop a theory of individual autonomy in the modern sense, the seeds were already sown. Socrates, in following his inner daímōn even against the conventions of the city, already exercised a form of rational self-governance. Aristotle, in defining the virtuous person as one who acts according to right reason (orthòs lógos) rather than mere obedience to custom, approached the idea that moral excellence requires an independent, deliberate, and free judgement.

Stoicism took a decisive step: for Epictetus, freedom consists in distinguishing what depends on us (eph’ hemîn) from what does not, and in exercising mastery over our judgements, impulses, and assents. This form of inner sovereignty — independent of external circumstances — anticipates elements that modernity would associate with the autonomy of the subject.

Kant: Autonomy as the Foundation of Morality

The Autonomy of the Will

It is with Immanuel Kant (1724–1804) that autonomy acquires its most rigorous and influential philosophical meaning. In the Groundwork of the Metaphysics of Morals (1785) and the Critique of Practical Reason (1788), Kant defines the autonomy of the will as the principle whereby the will gives itself the moral law, without determination by sensible inclinations, empirical interests, or external authorities.

The autonomous will is one that acts according to maxims it can itself will as universal laws. By contrast, heteronomy occurs when the will is determined by something external to it — the desire for pleasure, the fear of punishment, social pressure, or religious tradition. For Kant, every heteronomous ethics is deficient, because it transforms morality into an instrument of ends alien to pure practical reason.

The Categorical Imperative

The concept of autonomy is intrinsically linked to the categorical imperative, the supreme moral law that practical reason imposes upon itself. In the formula of universal law: “Act only according to that maxim whereby you can at the same time will that it should become a universal law.” In the formula of humanity as an end: “Act in such a way that you treat humanity, whether in your own person or in the person of any other, always at the same time as an end, and never merely as a means.”

The third formula — the principle of autonomy — synthesizes the preceding ones: every rational being is simultaneously legislator and subject in the “kingdom of ends,” an ideal community of moral agents who mutually recognize one another as bearers of dignity (Würde), not of price (Preis). Human dignity resides, precisely, in the capacity for moral self-legislation.

“What Is Enlightenment?” and Intellectual Maturity

In the celebrated essay Beantwortung der Frage: Was ist Aufklärung? (1784), Kant defines Enlightenment (Aufklärung) as “the human being’s emergence from self-incurred immaturity.” Immaturity (Unmündigkeit) consists in the inability to make use of one’s own understanding without the direction of another. Its cause lies not in a lack of understanding but in a lack of courage and resolution to use it: Sapere aude! — “Dare to know!”

Here autonomy reveals itself not merely as an abstract moral principle but as a concrete existential and political demand. The enlightened person is one who thinks for herself, who submits beliefs, traditions, and authorities to the tribunal of reason. Intellectual heteronomy — the laziness and cowardice of delegating thought to tutors, pastors, or rulers — is, for Kant, a form of moral culpability.

Rousseau: The General Will and Political Self-Legislation

Jean-Jacques Rousseau (1712–1778), whom Kant acknowledged as a decisive influence, articulated the concept of autonomy on the political plane. In The Social Contract (1762), Rousseau confronts the fundamental problem: how can human beings live in society without losing their freedom?

The answer lies in the general will (volonté générale): when citizens participate in crafting the laws to which they submit, they obey only themselves. A legitimate law is not an external imposition but the expression of the collective will of free individuals. “Obedience to a law one has prescribed to oneself is freedom,” Rousseau writes in Book I of The Social Contract.

Rousseauian autonomy is, therefore, collective self-legislation: the citizen is free not because she does whatever she wants (natural freedom), but because she participates in formulating the laws that govern common life (civil and moral freedom). The passage from the state of nature to the civil state replaces instinct with justice and confers upon human actions the morality they previously lacked.

This conception profoundly influenced Kant, who drew from it the idea that true freedom is not the absence of law but submission to a law that reason imposes upon itself. But whereas Rousseau conceives self-legislation on the collective-political plane, Kant internalizes it in the plane of individual moral conscience.

Mill: Autonomy, Individual Liberty, and the Limits of Interference

John Stuart Mill (1806–1873) approached autonomy from the perspective of individual liberty and the legitimate limits of state and social interference over the individual. In On Liberty (1859), Mill formulates the celebrated harm principle: the only purpose for which power can be rightfully exercised over any member of a civilized community, against his will, is to prevent harm to others. Over himself — over his own body and mind — the individual is sovereign.

Individuality and Development

For Mill, autonomy is not merely a negative right (freedom from coercion) but a positive condition for human flourishing. In Chapter III of On Liberty, titled “Of Individuality as One of the Elements of Well-Being,” Mill argues that the person who merely follows custom makes no choice. The faculty of choosing is a muscle that atrophies through disuse. The person who plans her own life employs all her faculties — observation, reasoning, judgement, mental activity, and moral discernment.

Mill opposes both governmental tyranny and the “tyranny of prevailing opinion,” which can be as oppressive as any law. Social conformity — the pressure to think and live as the majority does — threatens autonomy as much as state coercion.

Autonomy and Utilitarianism

It is important to note that, for Mill, the defence of autonomy is grounded in utilitarian reasons: individual liberty promotes general well-being because it permits experimentation with ways of living, the development of original characters, and the intellectual and moral progress of humanity. Autonomy is valuable not only intrinsically (as for Kant) but for its social fruits.

Existentialism: Sartre and Radical Freedom

Twentieth-century existentialism, especially in the work of Jean-Paul Sartre (1905–1980), radicalizes the concept of autonomy to the point of identifying it with the very condition of being human.

Existence Precedes Essence

In the lecture Existentialism Is a Humanism (1946), Sartre maintains that, for human beings, “existence precedes essence”: there is no predefined human nature, no divine project, no determinism that fixes in advance what we are. The human being is pure freedom — condemned to be free. Every choice constitutes us; every act is a self-definition.

Bad Faith and Responsibility

Bad faith (mauvaise foi) is the attempt to flee this radical freedom, to pretend that we are determined by our nature, our social role, or our circumstances. The waiter who identifies entirely with his function, the coward who attributes his cowardice to temperament — all practise bad faith, denying the autonomy that constitutes them.

For Sartre, autonomy is not an achievement but an ontological given: the human being is structurally free, and every attempt to deny that freedom is already a (dishonest) exercise of it. Responsibility is total and non-transferable. There are no excuses — no determinism, destiny, or human nature behind which to hide.

Situation and Freedom

A qualification is needed: Sartre does not deny that conditioning factors exist — facticity (facticité): the body, the epoch, social class, the past. But facticity does not determine; it furnishes the situation from which freedom is exercised. Freedom is always freedom in situation, and the situation acquires meaning only through the freedom that interprets and transcends it.

Frankfurt: Autonomy and Second-Order Desires

The American philosopher Harry Frankfurt (1929–2023) offered, from the 1970s onward, an influential reformulation of the concept of autonomy centred on the internal structure of the will.

First-Order and Second-Order Desires

In the seminal article “Freedom of the Will and the Concept of a Person” (1971), Frankfurt distinguishes between first-order desires (desires to do or have something) and second-order desires (desires about which first-order desires one wants to be moved to action by). An autonomous person is one whose effective desires correspond to the second-order desires she reflexively endorses.

Example: a person with a substance addiction may desire to consume the substance (first-order desire) while at the same time desiring not to have that desire (second-order desire). If she acts on the first-order desire against her second-order desire, she does not act autonomously — she is, in Frankfurt’s terms, a wanton, a being moved by impulses without hierarchical reflection.

Identification and Endorsement

For Frankfurt, autonomy does not require independence from all external influence (which would be impossible) but reflexive identification with one’s own motivating desires. The autonomous person is one who, upon examining her desires, recognizes herself in them — who can say: “Yes, this desire is genuinely mine, and I want it to move me to action.”

This conception has the advantage of being psychologically realistic: it does not require a disembodied pure reason (as in Kant) or an absolute freedom (as in Sartre), but a reflexive self-examination compatible with our condition as beings shaped by biology, culture, and history.

The Principle of Respect for Autonomy

In contemporary bioethics, autonomy has become one of the four fundamental principles in the principlist model of Tom Beauchamp and James Childress, formulated in Principles of Biomedical Ethics (1979, with subsequent editions). The four principles are: respect for autonomy, beneficence, non-maleficence, and justice.

Respect for autonomy requires acknowledging the patient’s decision-making capacity, providing adequate information, and accepting the individual’s choice even when it diverges from the medical recommendation. The patient is not an object of intervention but a subject of decision.

The practical expression of respect for autonomy in medicine is informed consent: the patient must receive comprehensible information about diagnosis, treatment options, risks, and benefits, and must be able to decide freely, without coercion. Informed consent presupposes three conditions:

  1. Information — the patient must be adequately informed.
  2. Comprehension — the information must be understood by the patient.
  3. Voluntariness — the decision must be free from coercion or manipulation.

Relational Autonomy

Feminist and communitarian thinkers have questioned the liberal-individualist conception of autonomy underlying principlism. Relational autonomy, developed by scholars such as Catriona Mackenzie and Natalie Stoljar, holds that autonomy is not exercised in a vacuum: it is constituted and conditioned by social relations, power structures, and contexts of oppression. A woman who “consents” to a procedure under family pressure or in conditions of socioeconomic vulnerability exercises a compromised autonomy. Recognizing the relational dimension of autonomy does not mean denying it but demanding that the social conditions for its effective exercise be guaranteed.

Tensions and Dialogues Among the Conceptions

The various conceptions of autonomy presented here are not simply complementary — they involve genuine tensions:

  • Kant vs. Mill: for Kant, autonomy is submission to the universal moral law that reason imposes upon itself; for Mill, it is the freedom to live as one chooses, provided no harm is caused to others. Kantian autonomy is formal and universalist; Millian autonomy is substantive and pluralist.

  • Kant vs. Sartre: both affirm freedom as constitutive of the subject, but Kant ties it to reason and the moral law, while Sartre identifies it with the pure indetermination of the for-itself (pour-soi). For Kant, freedom without moral law is anarchy; for Sartre, moral law without absolute freedom is bad faith.

  • Sartre vs. Frankfurt: Sartre rejects any psychological determinism; Frankfurt acknowledges that we are moved by desires we did not choose, and locates autonomy not in the absence of determination but in hierarchical reflection upon our desires.

  • Liberalism vs. relational autonomy: Beauchamp and Childress’s principlist model treats autonomy as an individual attribute; feminist critique insists that autonomy is socially constituted and that ignoring power relations is to reproduce them.

Conclusion

The trajectory of the concept of autonomy — from the political sovereignty of Greek póleis to informed consent in contemporary medicine — reveals an idea in constant re-elaboration, yet with a persistent core: the conviction that human beings are capable of governing themselves, of acting according to principles they recognize as their own, and that this capacity grounds both moral dignity and political legitimacy.

Kant gave the concept its most rigorous formulation; Rousseau showed that self-legislation can be collective; Mill demonstrated that individual autonomy requires protection against social tyranny; Sartre radicalized freedom to the point of anguish; Frankfurt offered a psychologically realistic model of self-governance; and contemporary bioethics translated the principle into clinical and institutional practice.

Understanding these multiple dimensions of autonomy is indispensable for any serious ethical, political, or existential reflection. The question “Who governs my life?” remains, after all, one of the most urgent — and most difficult — philosophical questions to answer.

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