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

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.

There is in my opinion a great similarity between the problems provided by the mysterious behavior of the atom and those provided by the present economic paradoxes confronting the world.

Scientific progress is measured in units of courage, not intelligence.

The measure of greatness in a scientific idea is the extent to which it stimulates thought and opens up new lines of research.

Living is worthwhile if one can contribute in some small way to this endless chain of progress.

A physical law must possess mathematical beauty.