I believe in mystery and, frankly, I sometimes face this mystery with great fear. In other words, I think that there are many things in the universe that we cannot perceive or penetrate, and that also we experience some of the most beautiful things in life only in a very primitive form. Only in relation to these mysteries do I consider myself to be a religious man.

The highest principles for our aspirations and judgments are given to us in the Jewish-Christian religious tradition.

Strive not to be a success, but rather to be of value.

May the conscience and the common sense of the peoples be awakened, so that we may reach a new stage in the life of nations, where people will look back on war as an incomprehensible aberration of their forefathers!

Learning is experience. Everything else is just information.

Things you can get access to, you should never memorize.

Intuitive powers played a central role in my scientific work, not wild speculation, yet a valued resource when no other approach was available.