The greatest value of psychology, and even of philosophy, consists in providing a solid knowledge of man so that the individual who studies them can safely employ himself in the conduct of his own life or, in other words, so that he can safely employ himself in the conscious direction of his own will. The study of man is valid as long as it allows the student to understand himself, discover himself and, finally, be what he wants to be. When he connects with his own will, the time comes when study is limited to providing reasons for its reaffirmation.