Conquer the world by intelligence, and not merely by being slavishly subdued by the terror that comes from it.

This illustrates an important truth, namely, that the worse your logic, the more interesting the consequences to which it gives rise.

Faith: a firm belief for which there is no evidence.

I never held Negroes to be inherently inferior. The statement in Marriage and Morals refers to environmental conditioning. I have had it withdrawn from subsequent editions because it is clearly ambiguous.

The pleasure of work is open to anyone who can develop some specialised skill, provided that he can get satisfaction from the exercise of his skill without demanding universal applause.

The human heart as modern civilization has made it is more prone to hatred than to friendship. And it is prone to hatred because it is dissatisfied.

Even in civilized mankind faint traces of monogamous instinct can be perceived.