 Although the two most basic aims Kant saw for moral philosophy are to seek out and establish the supreme principle of morality, they are not, in Kant’s view, its only aims. Moral philosophy, for Kant, is most fundamentally addressed to the first-person, deliberative question, “What ought I to do?”, and an answer to that question requires much more than delivering or justifying the fundamental principle of morality. We also need some account, based on this principle, of the nature and extent of the specific moral duties that apply to us. To this end, Kant employs his findings from the Groundwork in The Metaphysics of Morals, and offers a categorization of our basic moral duties to ourselves and others. In addition, Kant thought that moral philosophy should characterize and explain the demands that morality makes on human psychology and forms of human social interaction. These topics, among others, are addressed in central chapters of the second Critique, the Religion and again in the Metaphysics of Morals, and are perhaps given a sustained treatment in Anthropology from a Pragmatic Point of View. Further, a satisfying answer to the question of what one ought to do would have to take into account any political and religious requirements there are. Each of these requirement turn out to be, indirectly at least, also moral obligations for Kant, and are discussed in the Metaphysics of Morals and in Religion. Finally, moral philosophy should say something about the ultimate end of human endeavor, the Highest Good, and its relationship to the moral life. In the Critique of Practical Reason, Kant argued that this Highest Good for humanity is complete moral virtue together with complete happiness, the former being the condition of our deserving the latter. Unfortunately, Kant noted, virtue does not ensure wellbeing and may even conflict with it. Further, he thought that there is no real possibility of moral perfection in this life and indeed few of us fully deserve the happiness we are lucky enough to enjoy. Reason cannot prove or disprove the existence of Divine Providence, on Kant’s view, nor the immortality of the soul, which seem necessary to rectify these things. Nevertheless, Kant argued, an unlimited amount of time to perfect ourselves (immortality) and a commensurate achievement of wellbeing (ensured by God) are “postulates” required by reason when employed in moral matters.