Ideas won't keep. Something must be done about them.

Religion is what a person does in his solitariness.

Algebra reverses the relative importance of the factors in ordinary language.

Each generation criticizes the unconscious assumptions made by its parent. It may assent to them, but it brings them out in the open.

It is a safe rule to apply that, when a mathematical or philosophical author writes with a misty profundity, he is talking nonsense.

Our rate of progress is such that an individual human being, of ordinary length of life, will be called on to face novel situations which find no parallel in his past. The fixed person, for the fixed duties, who, in older societies was such a godsend, in the future will be a public danger.

[In many circumstances,] the most important thing about a proposition is not that it be true, but that it be interesting.