  In both the Groundwork of the Metaphysics of Morals and the Critique of Practical Reason, Kant also gives a more detailed argument for the conclusion that morality and freedom reciprocally imply one another, which is sometimes called the reciprocity thesis (Allison 1990). On this view, to act morally is to exercise freedom, and the only way to fully exercise freedom is to act morally. Kant’s arguments for this view differ in these texts, but the general structure of his argument in the Critique of Practical Reason may be summarized as follows.