The more I learn of physics, the more I am drawn to metaphysics.

For me a simple message, to think and act with courage, independence and imagination.

My comprehension of God comes from a deeply felt conviction of a superior intelligence that reveals itself in the knowable world.

While it is true that an inherently free and scrupulous person may be destroyed, such an individual can never be enslaved or used as a blind tool.

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.

Somebody who only reads newspapers and at best books of contemporary authors looks to me like an extremely near-sighted person who scorns eyeglasses. He is completely dependent on the prejudices and fashions of his times, since he never gets to see or hear anything else.

Playfullness is the essential feature of productive thought.