Mysteries are not necessarily miracles.

Even though the world as a whole progresses, youth must always start again from the beginning, and as individuals go through the epochs of the world's culture.

In art it's not the thinking that does the job, but making.

We eagerly get hold of a law that serves as a weapon to our passions.

Being brilliant is no great feat if you respect nothing.

Insofar as he makes use of his healthy senses, man himself is the best and most exact scientific instrument possible. The greatest misfortune of modern physics is that its experiments have been set apart from man, as it were, physics refuses to recognize nature in anything not shown by artificial instruments, and even uses this as a measure of its accomplishments.

He is a man whom it is impossible to please, because he is never pleased with himself.