Violence sometimes may have cleared away obstructions quickly, but it never has proved itself creative.

I am not only a pacifist but a militant pacifist. I am willing to fight for peace. Nothing will end war unless the people themselves refuse to go to war.

The idea of a personal God is an anthropological concept which I am unable to take seriously.

To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

Isn't it strange that I who have written only unpopular books should be such a popular fellow?

I came to America because of the great, great freedom which I heard existed in this country. I made a mistake in selecting America as a land of freedom, a mistake I cannot repair in the balance of my lifetime.

The word God is for me nothing more than the expression and product of human weaknesses.