Pure practical reason allows us to postulate that the laws of nature are compatible with the demands of morality because both have a common author.

As both the second critique and the preceding Groundwork for the Metaphysics of Morals make clear, Kant clearly recognizes that in order to act morally, we need to (i) understand the moral law and what it requires of us; (ii) believe that we are in fact free to choose to do what it requires of us rather than to do what all our other motives, which can be subsumed under the rubric of self-love, might suggest to us; (iii) believe that the objectives that morality imposes upon us can actually be ac