We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much more valid than the derivation.

There are theoretical physicists who imagine, deduce, and guess at new laws, but do not experiment; and then there are experimental physicists who experiment, imagine, deduce, and guess.

We've learned from experience that the truth will out.

Experiment is the sole judge of the validity of any idea.

Why make yourself miserable saying things like, "Why do we have such bad luck? What has God done to us? What have we done to deserve this?" - all of which, if you understand reality and take it completely into your heart, are irrelevant and unsolvable. They are just things that nobody can know. Your situation is just an accident of life.

We have this terrible struggle to try to explain things to people who have no reason to want to know.

We are trying to prove ourselves wrong as quickly as possible, because only in that way can we find progress.