The first step in wisdom, as well as in morality, is to open the windows of the ego as wide as possible.

The fact that all Mathematics is Symbolic Logic is one of the greatest discoveries of our age; and when this fact has been established, the remainder of the principles of mathematics consists of the analysis of Symbolic Logic itself.

The secret of happiness is this: let your interests be as wide as possible, and let your reactions to the things and persons that interest you be as far as possible friendly rather than hostile.

One of the chief triumphs of modern mathematics consists in having discovered what mathematics really is.

Literature is inexhaustible, with every book a homage to infinity

Love can only flourish as long as it is free and spontaneous; it tends to be killed by the thought that it is a duty. To say that it is your duty to love so-and-so is the surest way to cause you to hate him or her.

The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd.