Certitude drives people mad.

I admire the courage and wisdom of Socrates in everything he did, said--and did not say.

Every philosophy is the philosophy of some stage of life.

Every achievement, every step forward in knowledge, is the consequence of courage, of toughness towards oneself, of sincerity to oneself

Many people, especially women, never experience boredom because they have never learned to work properly.

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.

Love brings to light the lofty and hidden characteristics of the lover--what is rare and exceptional in him: to that extent it caneasily be deceptive with respect to what is normal in him.