Never resist temptation: prove all things: hold fast that which is good.

The man with a toothache thinks everyone happy whose teeth are sound. The poverty-stricken man makes the same mistake about the rich man.

A man thinking or working is always alone, let him be where he will.

The mathematician is fascinated with the marvelous beauty of the forms he constructs, and in their beauty he finds everlasting truth.

People must not be forced to adopt me as their favourite author, even for their own good.

All censorships exist to prevent anyone from challenging current conceptions and existing institutions.

Few people think more than two or three times a year; I have made an international reputation for myself by thinking once or twice a week.