Immanuel Kant (1724–1804) argued that moral requirements are based on a standard of rationality he dubbed the “Categorical Imperative” (CI). Immorality thus involves a violation of the CI and is thereby irrational. Other philosophers, such as Locke and Hobbes, had also argued that moral requirements are based on standards of rationality. However, these standards were either desirebased instrumental principles of rationality or based on sui generis rational intuitions. Kant agreed with many of his predecessors that an analysis of practical reason (...) will reveal only the requirement that rational agents must conform to instrumental principles. Yet he argued that conformity to the CI (a non-instrumental principle) and hence to moral requirements themselves, can nevertheless be shown to be essential to rational agency. This argument was based on his striking doctrine that a rational will must be regarded as autonomous, or free in the sense of being the author of the law that binds it. The fundamental principle of morality — the CI — is none other than the law of an autonomous will. Thus, at the heart of Kant's moral philosophy is a conception of reason whose reach in practical affairs goes well beyond that of a Humean ‘slave’ to the passions. Moreover, it is the presence of this self-governing reason in each person that Kant thought offered decisive grounds for viewing each as possessed of equal worth and deserving of equal respect. (shrink)

Mou Zongsan 牟宗三 is well known for his Kantian interpretation of Confucianism, while his understanding of Kant’s ethics is itself colored very much by Confucianism. Mou not only coined the idea “heteronomous morality” ; he also maintained that Kant’s ethics actually espouses heteronomous morality. In this essay, I will first analyze Mou’s idea of heteronomy and his criticism of heteronomous morality and point out that, characterizing Zhu Xi’s 朱熹 philosophy as ethics of heteronomy, Mou gives up a fundamental element in (...) Kant’s idea of heteronomy, according to which heteronomous principles are all principles of self-love. I will then expound Mou’s ideas of moral feelings and moral acts presupposed in his idea of heteronomy and criticism of heteronomous morality and contrast my interpretation with two important interpretations, those of Lee Ming-huei 李明輝 and Sébastien Billioud. (shrink)