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

I learnt to distrust all physical concepts as the basis for a theory. Instead one should put one's trust in a mathematical scheme, even if the scheme does not appear at first sight to be connected with physics. One should concentrate on getting interesting mathematics.

No. I had successfully solved the difficulty of finding a description of the electron which was consistent with both relativity and quantum mechanics. Of course, when you solve one difficulty, other new difficulties arise. You then try to sove them. You can never solve all difficulties at once.

It is more important to have beauty in one's equations than to have them fit experiment.

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

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

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.