How vain it is to sit down to write when you have not stood up to live.

What is most of our boasted so-called knowledge but a conceit that we know something, which robs us of the advantage of our actual ignorance?

True friendship can afford true knowledge. It does not depend on darkness and ignorance.

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

What sort of philosophers are we, who know absolutely nothing of the origin and destiny of cats?

Misfortunes occur only when a man is false.... Events circumstances etc. Have their origin in ourselves. They spring from seeds which we have sown.