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The Metaphysics of Morals is Kant's final major work in moral philosophy. In it, he presents the basic concepts and principles of right and virtue and the system of duties of human beings as such. The work comprises two parts: the Doctrine of Right concerns outer freedom and the rights of human beings against one …

From the introduction: "The Science of Right has for its object the principles of all the laws which it is possible to promulgate by external legislation. Where there is such a legislation, it becomes, in actual application to it, a system of positive right and law; and he who is versed in the knowledge of this system …