The greatest progress that the human race has made lies in learning how to make correct inferences.

I call Christianity the one great curse, the one great intrinsic depravity, and the one great instinct of revenge, for which no means are venomous enough, or secret, subterranean and small enough - I call it the one immortal blemish on the human race.

Men seldom persevere in a vocation unless they believe or can convince themselves that it is fundamentally more important than anyother calling. Women are the same with their lovers.

When horror is associated with what is harmful, evil results, when disgust does, badness.

But the worst enemy you can meet will always be yourself; you lie in wait for yourself in caverns and forests. Lonely one, you are going the way to yourself! And your way goes past yourself, and past your seven devils! You will be a heretic to yourself and witch and soothsayer and fool and doubter and unholy one and villain. You must be ready to burn yourself in your own flame: how could you become new, if you had not first become ashes?

Life is a well of joy; but for those out of whom an upset stomach speaks, which is the father of melancholy, all wells are poisoned.

What doesn't kill you, only makes you stronger