Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing.

Men should learn to live with the same seriousness with which children play.

Is man merely a mistake of God's? Or God merely a mistake of man?

A book calls for pen, ink, and a writing desk; today the rule is that pen, ink, and a writing desk call for a book.

We should conserve evil just as we should conserve the forests. It is true that by thinning and clearing the forests the earth grew warmer.

What can everyone do? Praise and blame. This is human virtue, this is human madness.

A man who is very busy seldom changes his opinions.