Moral agency requires autonomy — the capacity to act from self-given principles rather than being fully caused by prior physical states.

It is, however, controversial whether Kant himself was a constructivist in this sense. One reason to question whether this is the right way to read Kant follows from the fact that Kant himself did not see morality as free from metaphysical commitments. For example, Kant thought that it would be impossible for someone who believed that mechanistic determinism was the literal truth about himself to believe that he was a moral agent, since morality requires an autonomy that is incompatible with det