I admired Bohr very much. We had long talks together, long talks in which Bohr did practically all the talking.

The shortage of buyers, which the world is suffering from, is readily understood, not as due to people not wishing to obtain possession of goods, but as people being unwilling to part with something which might earn a regular income in exchange for those goods.

The methods of theoretical physics should be applicable to all those branches of thought in which the essential features are expressible with numbers.

God used beautiful mathematics in creating the world.

It seems that if one is working from the point of view of getting beauty in one's equations, and if one has really a sound insight, one is on a sure line of progress.

If there is a God, he's a great mathematician.

What makes the theory of relativity so acceptable to physicists in spite of its going against the principle of simplicity is its great mathematical beauty. This is a quality which cannot be defined, any more than beauty in art can be defined, but which people who study mathematics usually have no difficulty in appreciating.