The Metaphysics of Morals (German: Die Metaphysik der Sitten) is a 1797 work of political and moral philosophy by Immanuel Kant. It is also Kant's last major work in moral philosophy. The work is divided into two sections: the Doctrine of Right, dealing with political rights, and the Doctrine of Virtue, dealing with ethical virtues.

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Metaphysics of Morals

Cover of the first edition
Author	Immanuel Kant
Original title	Die Metaphysik der Sitten
Translator	Mary J. Gregor
Country	Germany
Language	German
Subject	Ethics
Published	1797
Media type	Print

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In this work, Kant develops the political and ethical philosophy for which the Groundwork and Critique of Practical Reason provide the foundation.

The work is divided into two main parts, the Rechtslehre and the Tugendlehre. Mary J. Gregor's translation (1991) explains these German terms as, respectively, the Doctrine of Right, which deals with the rights that people have, and the Doctrine of Virtue, which deals with the virtues they ought to acquire.

Rechtslehre has also been translated as the Science of Right (Hastie) or the Metaphysical Elements of Justice (Ladd).

The Doctrine of Right is grounded in republican interpretation of origins of political community as civil society and establishment of positive law. Published separately in 1797, the Doctrine of Right is one of the last examples of classical republicanism in political philosophy.^[1] The Doctrine of Right contains the most mature of Kant's statements on the peace project and a system of law to ensure individual and public rights.

The Doctrine of Virtue develops Kant's ethical theory, which he had already laid the foundation in the Groundwork of the Metaphysics of Morals (1785). Kant particularly emphasizes treating humanity as an end in itself. The duties are analytically treated by Kant, who distinguishes duties towards ourselves from duties towards others. The duties are classified as perfect duties and imperfect duties. Kant thinks imperfect duties allow a latitudo, i.e., the possibility of choosing maxims. The perfect duties instead do not allow any latitudo. Kant uses this distinction in discussing some of the duties that were shown as examples in the Groundwork in more detail (viz., not lying, not committing suicide, cultivating one's talents, and being beneficent toward others).

Thus, Kant distinguishes "Virtue" and "Right": the "Doctrine of Right" contains rights as perfect duties towards others only.

In the English-speaking world, the Metaphysics of Morals (1797) is not as well known as Kant's earlier works, the Groundwork of the Metaphysics of Morals (1785) and the Critique of Practical Reason (1788), but it has experienced a renaissance through the pioneering work of Mary J. Gregor.^[2]

Translations of the entire book:

• Kant, Immanuel (1991). The Metaphysics of Morals. Translated by Mary J. Gregor. Cambridge University Press. ISBN 0-521-30372-9 – via Internet Archive..
• Kant, Immanuel. The Metaphysics of Morals. Translated by Mary J. Gregor. Cambridge University Press, 1996. ISBN 0-521-56673-8.
• Kant, Immanuel. The Metaphysics of Morals. In Practical Philosophy. Edited by Mary J. Gregor. Cambridge University Press, 1996.
• Translated by Anonymous (John Richardson), "Metaphysic of Morals divided into Metaphysical Elements of Law and of Ethics." 2 vols. (London [Hamburg]: William Richardson, 1799).

Translations of Part I:

• Kant, Immanuel. The Philosophy of Law: An Exposition of the Fundamental Principles of Jurisprudence as the Science of Right. Translated by W. Hastie. Edinburgh: T. & T. Clark, 1887; reprinted by Augustus M. Kelly Publishers, Clifton, NJ, 1974. [introduction and all of part I]
• Kant, Immanuel. The Metaphysical Elements of Justice; Part I of the Metaphysics of Morals. 1st ed. Translated by John Ladd. Indianapolis: Bobbs-Merrill, 1965. [introduction and most of part I]
• Kant, Immanuel. The Metaphysics of Morals. In Kant: Political Writings. 2nd enl. ed. Edited by Hans Reiss. Translated by H. B. Nisbet. Cambridge: Cambridge University Press, 1991. [selections from part I]
• Kant, Immanuel. The Metaphysical Elements of Justice; Part I of the Metaphysics of Morals. 2nd ed. Translated by John Ladd. Indianapolis: Bobbs-Merrill, 1999. [introduction and all of part I]
• Kant, Immanuel. Metaphysics of Morals, Doctrine of Rights, Section 43-section 62. In Toward Perpetual Peace and Other Writings on Politics, Peace, and History. Edited by Pauline Kleingeld. Translated by David L. Colclasure. New Haven: Yale University Press, 2006. [selections from part I, concerning public right]

Translations of Part II:

• Kant, Immanuel, The Doctrine of Virtue. Translated by Mary J. Gregor. New York: Harper & Row Torchbooks, 1964; reprinted by the University of Pennsylvania Press, 1971.
• Translated by James Wesley Ellington, in Ethical Philosophy. Indianapolis: Hackett, 1983 [1964]. [Part II]
• Translated by John William Semple, "The Metaphysic of Ethics." Edinburgh: Thomas Clark, 1836; Reprint editions include 1871, ed. Henry Calderwood (Edinburgh: T. & T. Clark). [Introduction and portions of part II]

• 1797 in literature
• Anthropology
• Ethics
• Immanuel Kant bibliography
  • The Critique of Practical Reason
  • The Groundwork of the Metaphysics of Morals
  • Religion Within the Boundaries of Mere Reason
• Kantianism
• Philosophy of life