America is a large country and its people have so far not shown much interest in great international problems, among which the problem of disarmament occupies first place today. This must be changed, if only in America's own interest. The last war has shown that there are no longer any barriers between the continents and that the destinies of all countries are closely interwoven. The people of this country must realize that they have a great responsibility in the sphere of international politics. The part of passive spectator is unworthy of this country and is bound in the end to lead to disaster all round.

The bigotry of the nonbeliever is for me nearly as funny as the bigotry of the believer.

It is easier to denature plutonium than to denature the evil spirit of man.

It is my conviction that pure mathematical construction enables us to discover the concepts and the laws connecting them, which gives us the key to the understanding of nature ... In a certain sense, therefore, I hold it true that pure thought can grasp reality, as the ancients dreamed.

Imagination is the most powerful force in the universe.

Mathematics deals exclusively with the relations of concepts to each other without consideration of their relation to experience.

What I value in life is quality rather then quantity.