The Arab who built himself a hut with marbles from the temple of Palmyra is more philosophical than all the curators of the museums of London, Paris, and Munich.

We live between two dense clouds; the forgetting of what was and the uncertainty of what will be.

It is remarkable how great an influence our clothes have on our moral state.

If fifty million people say a foolish thing, it is still a foolish thing.

Do not try to satisfy your vanity by teaching a great many things. Awaken people's curiosity. It is enough to open minds; do not overload them. Put there just a spark. If there is some good inflammable stuff, it will catch fire.

Man is a rational animal. He can think up a reason for anything he wants to believe.

It is almost impossible systematically to constitute a natural moral law. Nature has no principles. She furnishes us with no reason to believe that human life is to be respected. Nature, in her indifference, makes no distinction between good and evil.