The reproaches against science for not having yet solved the problems of the universe are exaggerated in an unjust and malicious manner; it has truly not had time enough yet for these great achievements. Science is very young--a human activity which developed late.

When a love-relationship is at its height there is no room left for any interest in the environment; a pair of lovers are sufficient to themselves

The aim of psychoanalysis is to relieve people of their neurotic unhappiness so that they can be normally unhappy.

The paranoid is never entirely mistaken.

The behavior of a human being in sexual matters is often a prototype for the whole of his other modes of reaction in life.

I do not in the least underestimate bisexuality... I expect it to provide all further enlightenment.

The only shame in masturbation is the shame of not doing it well.