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

The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.

It is only men who are free, who create the inventions and intellectual works which to us moderns make life worth while.

Time and space are modes by which we think and not conditions in which we live.

I assert that the cosmic religious experience is the strongest and the noblest driving force behind scientific research.

There is no scientific antidote, only education. You've got to change the way people think. I am not interested in disarmament talks between nations . . . What I want to do is to disarm the mind. After that, everything else will automatically follow. The ultimate weapon for such mental disarmament is international education.

Figuring out how to think about the problem.