War will disappear only when men shall take no part whatever in violence and shall be ready to suffer every persecution that their abstention will bring them. It is the only way to abolish war.

The dog is a religious animal. In his savage state he worships the moon and the lights that float upon the waters. These are his gods to whom he appeals at night with long-drawn howls.

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.

Never lend books, for no one ever returns them

One thing above all gives charm to men's thoughts, and this is unrest. A mind that is not uneasy irritates and bores me.

I am a physician. I keep a drug-shop of lies. I give relief, consolation. Can one console and relieve without lying? ... Only women and doctors know how necessary and how helpful lies are to men.

Change is the essence of life.