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

A book on the new physics, if not purely descriptive of experimental work, must essentially be mathematical.

I do not see how a man can work on the frontiers of physics and write poetry at the same time. They are in opposition.

It is more important to have beauty in one's equations than to have them fit experiment... 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 not complete agreement between the results of one's work and experiment, one should not allow oneself to be too discouraged, because the discrepancy may well be due to minor features that are not properly taken into account and that will get cleared up with further developments of the theory.

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

I consider that I understand an equation when I can predict the properties of its solutions, without actually solving it.

The aim of science is to make difficult things understandable in a simpler way; the aim of poetry is to state simple things in an incomprehensible way. The two are incompatible.