Love is often nothing but a favorable exchange between two people who get the most of what they can expect, considering their value on the personality market.

That millions of people share the same forms of mental pathology does not make these people sane.

Infantile love follows the principle: "I love because I am loved." Mature love follows the principle: "I am loved because I love." Immature love says: "I love you because I need you." Mature love says: "I need you because I love you.

Whether...a change from the supremacy of natural science to a new social science will take place...depends on one factor: how many brilliant, learned, disciplined, and caring men and women are attracted by the new challenge.

The fact that millions of people share the same vices does not make these vices virtues, the fact that they share so many errors does not make the errors to be truths, and the fact that millions of people share the same form of mental pathology does not make these people sane.

When blended with sexuality, the death instinct is transformed into more harmless impulses expressed in sadism or masochism.

Man is the only animal for whom his own existence is a problem which he has to solve.