If only I had known, I should have become a watchmaker.

I made one great mistake in my life-when I signed the letter to President Roosevelt recommending that atom bombs be made but there was some justification-the danger that the Germans would make them.

Anger dwells only in the bosom of fools.

Women always worry about things that men forget; men always worry about things women remember.

Imagination is more important than knowledge. For knowledge is limited to all we now know and understand, while imagination embraces the entire world, and all there ever will be to know and understand.

I hate all the loathsome nonsense that goes with patriotism.

The wonder of nature does not become smaller because one cannot measure it by the standards of human moral and human aims.