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.

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

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.