Kant: Autonomy Is the Will's Self-Legislation

The Quote

"Autonomy of the will is the property of the will by which it is a law to itself" is Kant's formal definition of moral autonomy, from Section II of the Groundwork of the Metaphysics of Morals (1785). It is the concept on which his entire moral philosophy turns: the will that gives itself its own law is the only will that is both free and subject to obligation without contradiction.

Context

The passage occurs in the part of the Groundwork where Kant presents the categorical imperative in its third formulation — the principle of autonomy — after the formulations of universal law and of humanity as an end in itself. Kant has argued that a will determined by objects of inclination is heteronomous: its principle comes from outside itself, and it is therefore not self-governing. The autonomous will, by contrast, takes as its principle nothing but the mere form of universal lawgiving, and this self-legislation is the source of the will's freedom and of the dignity of the rational being.

Meaning & Interpretation

The definition contains two claims. Negatively, autonomy excludes determination by "any property of the objects of volition" — desires, pleasures, goods — which would make the will a servant of inclination. Positively, autonomy is self-legislation: the will is "a law to itself," which means that the moral law is not imposed on us from outside but is the law of our own rational nature. The connection to freedom is direct: a will that gives itself its law is not causally pushed by foreign objects, and in obeying its own law it is exercising, not surrendering, its freedom. Obligation and freedom are thus reconciled: we are bound by the moral law because it is our own.

Legacy

Kant's concept of autonomy became one of the most influential ideas in modern ethics and politics. It grounds the principle of human dignity, the ideal of moral self-government, and the political ideal of autonomy as self-determination. It was developed by Fichte, contested by Hegel, and transformed by later ethicists into the contemporary debates about personal autonomy in bioethics and liberal theory. In the free will debate, Kant's equation of freedom with self-legislation remains a standing alternative to both Humean compatibilism and libertarian accounts of uncaused choice.

Sources

1. Johnson, R. & Cureton, A. (2021). "Kant's Moral Philosophy." Stanford Encyclopedia of Philosophy. https://plato.stanford.edu/entries/kant-moral/
2. Kant, I. (1785). Groundwork of the Metaphysics of Morals, in Practical Philosophy, trans. M. Gregor. Cambridge University Press.
3. Christman, J. (2020). "Autonomy in Moral and Political Philosophy." Stanford Encyclopedia of Philosophy. https://plato.stanford.edu/entries/autonomy-moral/
4. Sensen, O. (2019). "Kant on Autonomy." Oxford Handbook of Kant. Oxford University Press.