(there is) no other means of escaping from one's consciousness than to deny it, to look upon it as an organic disease of the terrestrial intelligence - a disease which we must endeavor to cure by an action which must appear to us an action of violent and willful madness, but which, on the other side of our appearances, is probably an action of health. ("Of Immortality")

Human unhappiness is evidence of our immortality.

Misguided good men are more dangerous than honest bad men. It is because they are seen as good that, in and by good conscience, the mob will always, stubbornly back them without question.

You spoke your words as though you denied the very existence of the shadows or of evil. Think, now: where would your good be if there were no evil and what would the world look like without shadow?

But would you kindly ponder this question: What would your good do if evil didn't exist, and what would the earth look like if all the shadows disappeared? After all, shadows are cast by things and people. Here is the shadow of my sword. But shadows also come from trees and living beings. Do you want to strip the earth of all trees and living things just because of your fantasy of enjoying naked light? You're stupid.

What would your good do if evil didn't exist, and what would the earth look like if all the shadows disappeared?