I cannot then believe in this concept of an anthropomorphic God who has the powers of interfering with these natural laws. As I said before, the most beautiful and most profound religious emotion that we can experience is the sensation of the mystical. And this mysticality is the power of all true science.

If you want to find out anything from the theoretical physicists about the methods they use, I advise you to stick closely to one principle: don't listen to their words, fix your attention on their deeds. To him who is a discoverer in this field the products of his imagination appear so necessary and natural that he regards them, and would like to have them regarded by others, not as creations of thought but as given realities.

The formulation of the problem is often more essential than its solution, which may be merely a matter of mathematical or experimental skill.

The only rational way of educating is to be an example. If one can't help it, a warning example.

Blind belief in authority is the greatest enemy of truth.

I am neither especially clever nor especially gifted. I am only very, very curious.

The most important thing is to not stop questioning.