This article consists of three parts. In the first part I present the three most important positions in the philosophical discussion of human nature, and I sketch the conceptions of moral life that are connected with each of these positions. The most extensively described position is the socalled person-theory, which I myself maintain. In the second part I develop the critique of the theory of needs (taken as a general theory of motivation), which was mentioned already in the first part, and I argue that the theory of motivation which is included in my person-theory (according to which part of human motivation consists of potentials, not needs) contributes to answering the normative question about man's destination, a contribution that is i...