When a man reaches his maturity in understanding and in years, the feeling comes over him that his father was wrong to beget him.

The magnitude of a progress is gauged by the greatness of the sacrifice that it requires.

Certitude drives people mad.

The complete irresponsibility of man for his actions and his nature is the bitterest drop which he who understands must swallow.

Learning from one's enemies is the best way to love them, for it puts one into a grateful mood toward them.

I could dispense with nothing when I created the superman. His seed still carries all your evil and falsehood, your lies and yourignorance.

One does well to put on gloves when reading the New Testament. The proximity of so much uncleanliness almost forces one to do this.