Give back to the world at least what you've received.

The mathematician knows some things, no doubt, but not those things one usually wants to get from him.

One has to realize that the powerful industrial groups concerned in the manufacture of arms are doing their best in all countries to prevent the peaceful settlement of international disputes, and that rulers can achieve this great end only if they are sure of the vigorous support of the majority of their peoples.

Peace cannot be kept by force; it can only be achieved by understanding.

I owe as much of my success to an uncompromising obstinacy as to any original ideas.

People are like bicycles. They can keep their balance only as long as they keep moving.

The release of atomic power has changed everything except our way of thinking ... the solution to this problem lies in the heart of mankind. If only I had known, I should have become a watchmaker. (1945)