Abstract

This chapter aims to situate Kant’s account of practical reason in metaethical debates. First, it explains the reasons why it is legitimate and instructive to discuss Kant’s relevance in contemporary metaethics, hence addressing some issues about the intended scope of metaethics and its relation to practical reason and psychology. Second, it defends an interpretation of Kant’s conception of autonomy, which avoids some paradoxes traditionally associated with self-legislation. Third, it shows that constructivism best captures Kant’s conception of practical reason and of its authority. Kantian constructivism is defended as a self-standing metaethical theory, which is designed to account for the objectivity and unconditional authority of practical knowledge, on the basis of standards congruent with shared subjective experience. This version of constructivism, adopting a “dialogical” interpretation of the autonomy of rational will, explains how finite rational agents are obligated and bound by the moral law.