The critical Kant no longer advanced the view that man can achieve his happiness with the aid of prudence. In the Critique of Practical Reason Happiness is a part of the highest good, which presupposes the existence of God. Rather than prudence, it is morality alone by which man can contribute to realizing the highest good. In his Anthropology, Kant discusses issues which are relevant for each philosophy of happiness, for example the importance of change as such.