In a famous passage from his Logic, Kant says that three questions — What can I know? What ought I to do? What may I hope for? — ultimately hang on the third one, which is the question of Man. This paper examines the nature of this special link between the very ends of philosophy and the question of Man. Its intent is to show how Culture, as receptive to Ideas, provides both the unity of the different definitions of Man given by Kant, and the condition of possibility for the questioning of philosophy. This distinctive quality of man, according to Kant, is the precondition for Metaphysics, Ethics, and Religion. In the end, philosophy's principle of unity lies not in the limitation or finiteness of man, but in the fact that man, according to Kant, is always in relation with some form of infinity, whether it is that of Ideas (metaphysics), that of the Law (ethics), or that of the ultimate Good (religion).