Failure is success in progress

The state is made for man, not man for the state.... That is to say, the state should be our servant and not we its slaves

The process of scientific discovery is, in effect, a continual flight from wonder.

I never think of the future. It comes soon enough. When visiting the U.S. from Germany for a winter academic stay.

The opinion prevailed among advanced minds that it was time that belief should be replaced increasingly by knowledge; belief that did not itself rest on knowledge was superstition, and as such had to be opposed.

If I could do it all again, I'd be a plumber.

You cannot beat a roulette table unless you steal money from it.