The scientist is activated by a wonder and awe before the mysterious comprehensibility of the universe which is yet finally beyond his grasp. In its profoundest depths it is inaccessible to man.

Thinking is hard work; that's why so few do it.

You are the only person I know who has the same attitude towards physics as I have: belief in the comprehension of reality through something basically simple and unified... It seems hard to sneak a look at God's cards. But that He plays dice and uses 'telepathic' methods... is something that I cannot believe for a single moment.

Relativity is a purely scientific matter and has nothing to do with religion.

America is today the hope of all honorable men who respect the rights of their fellow men and who believe in the principle of freedom and justice.

In living through this great epoch, it is difficult to reconcile oneself to the fact that one belongs to that mad, degenerate species that boasts of its free will. How I wish that somewhere there existed an island for those who are wise and of good will. In such a place even I should be an ardent patriot!

I believe that whatever we do or live for has its causality; it is good, however, that we cannot see through to it.