“The men who really believe in themselves are all in lunatic asylums.”

“I said to him, "Shall I tell you where the men are who believe most in themselves? For I can tell you. I know of men who believe in themselves more colossally than Napoleon or Caesar. I know where flames the fixed star of certainty and success. I can guide you to the thrones of the Super-men. The men who really believe in themselves are all in lunatic asylums.”

“Because we are not in a civilization which believes strongly in oracles or sacred places, we see the full frenzy of those who killed themselves to find the sepulcher of Christ. But being in a civilization which does believe in this dogma of fact for facts’ sake, we do not see the full frenzy of those who kill themselves to find the North Pole.”

“When men have come to the edge of a precipice, it is the lover of life who has the spirit to leap backwards, and only the pessimist who continues to believe in progress.”

“Psychoanalysis is a science conducted by lunatics for lunatics. They are generally concerned with proving that people are irresponsible; and they certainly succeed in proving that some people are”

“When men choose not to believe in God, they do not thereafter believe in nothing, they then become capable of believing in anything.”

“Now in history there is no Revolution that is not a Restoration. Among the many things that leave me doubtful about the modern habit of fixing eyes on the future, none is stronger than this: that all the men in history who have really done anything with the future have had their eyes fixed upon the past.”