The extraordinary courage and wisdom of Kant and Schopenhauer have succeeded in gaining the most difficult victory, the victory over the optimism concealed in the essence of logic-an optimism that is the basis of our culture.

Logic is a poor guide compared with custom.

Fear is the enemy of logic.

The true logic of this world is in the calculus of probabilities.

This freedom and heavenly cheer I have placed over all things like an azure bell when I taught that over them and through them no 'eternal will' wills. This prankish folly I have put in the place of that will when I taught: In everything one thing is impossible: rationality.

As a rational being, he now places his behavior under the control of abstractions. He will no longer tolerate being carried away by sudden impressions, by intuitions.