We must love or we grow ill.

The idea of men's receiving an intimation of their connection with the world around them through an immediate feeling which is from the outset directed to that purpose sounds so strange and fits in so badly with the fabric of our psychology that one is justified in attempting to discover a psycho-analytic - that is, a genetic - explanation of such a feeling.

Desire presses ever forward unsubdued.

In almost every place where we find totems we also find a law against persons of the same totem having sexual relations with one another and consequently against their marrying. This, then, is 'exogamy', an institution related to totemism.

In the development of mankind as a whole, just as in individuals, love alone acts as the civilizing factor in the sense that it brings a change from egoism to altruism.

America is the most grandiose experiment the world has seen, but, I am afraid, it is not going to be a success.

The liberty of the individual is no gift of civilization. It was greatest before there was any civilization, though then, it is true, it had for the most part no value, since the individual was scarcely in a position to defend it. The development of civilization imposes restrictions on it, and justice demands that no one shall escape those restrictions.