Nietzsche is really a modern psychologist. In our days, he would have made a famous analyst, for he had an ingenious flare for the dark background and the secret motivations; he has anticipated a great deal of Freud and Adler.
Jung reads Nietzsche as a proto-depth-psychologist whose attention to shadow, motivation, and the underside of civilization anticipates the founding moves of both Freudian and Adlerian psychology.
, Nietzsche's Zarathustra: Notes of the Seminar Given in 1934-1939, 1988thesis