‚Die Kritik der reinen Vernunft hat die Wirklichkeit der Freiheit nicht bewiesen, ja nicht einmal deren Möglichkeit.‘

A famous passage in the first Critique (A 557 f.) often gives rise to the belief that Kant had not yet delivered a full treatment of freedom in 1781 and intended to shift this treatment to future writings. However, a closer inspection of the passage reveals that, to the contrary, Kant claims that due to the limitations of human reason his critical account of freedom given thus far must be considered complete. And indeed, this account reappears unchanged in the Groundwork. When considered in this light, not only do the exact achievements of the first Critique concerning Kant’s doctrine of freedom become evident, but so too does the further development of this doctrine. In 1785, the Groundwork supplies a new conceptual link between freedom and the moral law (and with it an explanation of the possibility of categorical imperatives). And thanks to this very link, Kant is able, in the second Critique (1787/88), to remedy a ‘dogmatic’ mistake (discovered by a reviewer in 1786) in his 1781/85 account of freedom.