The vain.- We are like shop windows in which we are continually arranging, concealing or illuminating the supposed qualities other ascribe to us - in order to deceive ourselves.

So far no one had had enough courage and intelligence to reveal me to my dear Germans. My problems are new, my psychological horizon frighteningly comprehensive, my language bold and clear; there may well be no books written in German which are richer in ideas and more independent than mine.

The higher its type, the more rarely a thing succeeds.

The question of place and climate is most closely related to the question of nutrition. Nobody is free to live everywhere; and whoever has to solve great problems that challenge all his strength actually has a very restricted choice in this matter. The influence of climate on our metabolism, its retardation, its acceleration, goes so far that a mistaken choice of place and climate can not only estrange a man from his task but can actually keep it from him: he never gets to see it.

Wherever primitive man put up a word, he believed he had made a discovery. How utterly mistaken he really was! He had touched a problem, and while supposing he had solved it, he had created and obstacle to its solution. Now, with every new knowledge we stumble over flint-like and petrified words and, in so doing, break a leg sooner than a word.

Close beside my knowledge lies my black ignorance.

Whenever the strength of a belief strongly steps into the foreground, we must infer a certain weakness of demonstrability and the improbability of that belief.