I came- though the child of entirely irreligious (Jewish) parents - to a deep religiousness, which, however, reached an abrupt end at the age of twelve.

One of the strongest motives that lead men to art and science is escape from everyday life with its painful crudity and hopeless dreariness, from the fetters of one's own ever-shifting desires. A finely tempered nature longs to escape from the personal life into the world of objective perception and thought.

Be kind to people who are different from you.

I have never looked upon ease and happiness as ends in themselves. This ethical basis I call the ideal of the pigsty.

Something deeply hidden had to be behind things.

I have only two rules which I regard as principles of conduct. The first is: Have no rules. The second is: Be independent of the opinion of others.

An evening everyone agrees, is a lost evening.