I cannot call to mind a single instance where I have ever been irreverent, except toward the things which were sacred to other people.

The universal brotherhood of man is our most precious possession, what there is of it.

He had discovered a great law of human action, without knowing it - namely, that in order to make a man or a boy covet a thing, it is only necessary to make the thing difficult to obtain.

When you cannot get a compliment any other way pay yourself one.

A mathematician, like a painter or a poet, is a maker of patterns. If his patterns are more permanent than theirs, it is because they are made with ideas.

A mathematician is a device for turning coffee into theorems.