I believe that there never was a creator of a philosophical system who did not confess at the end of his life that he had wasted his time. It must be admitted that the inventors of the mechanical arts have been much more useful to men that the inventors of syllogisms. He who imagined a ship towers considerably above him who imagined innate ideas.

Ideas are like beards; men do not have them until they grow up.

The harmony of a concert, to which you listen with delight, must have on certain classes of minute animals the effect of terrible thunder; perhaps it kills them.

Prejudices are what rule the vulgar crowd.

I hate women because they always know where things are.

You have no control over the hand that life deals you, but how you play that hand is entirely up to you.

The more he became truly wise, the more he distrusted everything he knew.