To harm another is to harm oneself.

Do not do to others what angers you if done to you by others.

I do not believe in immortality of the individual, and I consider ethics to be an exclusively human concern with no superhuman authority behind it.

The real danger in life is not death, but living an evil life.

If one knows what is right, he will do it; nobody wants to be evil.

The misuse of language induces evil in the soul.