One should not be deceived: great spirits are skeptics ... Strength, FREEDOM which is born of the strength and overstrength of the spirit, proves itself by skepticism. Men of conviction are not worthy of the least consideration in fundamental questions of value and disvalue. Convictions are prisons.

How good music and bad reasons sound when one marches against an enemy.

Evolution does not make happiness its goal; it aims simply at evolution and nothing else.

What is the truth, but a lie agreed upon.

One often contradicts an opinion when what is uncongenial is really the tone in which it was conveyed.

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

We cannot even reproduce our thoughts entirely in words.