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.

Mere thinking cannot reveal to us the highest purpose.

To dwell on the things that depress or anger us does not help in overcoming them. One must knock them down alone.

My position concerning God is that of an agnostic. I am convinced that a vivid consciousness of the primary importance of moral principles for the betterment and ennoblement of life does not need the idea of a law-giver, especially a law-giver who works on the basis of reward and punishment.

Mozart's music is so pure and beautiful that I see it as a reflection of the inner beauty of the universe.

I think that a particle must have a separate reality independent of the measurements. That is an electron has spin, location and so forth even when it is not being measured. I like to think that the moon is there even if I am not looking at it.

Creative energy is more critical than learning.