This article aims to explain how the concept of will to power, derived from Nietzsche's philosophy, is used by C. G. Jung in his work Psychology of the Unconscious to solve a problem present in the first psychoanalytic school, namely: the unilaterality of neurosis. When Jung identifies certain gaps in Freud's theory of repression, he will reformulate the theory of neurosis based on the appropriation that Alfred Adler, one of Freud's first disciples, makes of the Nietzschean concept. We will see (...) how Jung will use the opposition between Freud's theory of Eros and Adler's theory, which, in turn, considers power as the main mechanism of the nervous character. By equally analyzing both theories, Jung will come to the conclusion that the problem of neurosis can be solved by unifying its antagonisms. Thus, he will develop a basic idea in his analytical psychology: that of psychological types or types of attitudes. (shrink)