The problem of creating something new, but which is consistent with everything which has been seen before, is one of extreme difficulty.

If the professors of English will complain to me that the students who come to the universities, after all those years of study, still cannot spell 'friend,' I say to them that something's the matter with the way you spell friend.

All we know so far is what doesn't work.

But the real glory of science is that we can find a way of thinking such that the law is evident.

All theoretical chemistry is really physics; and all theoretical chemists know it.

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.

I think I can safely say that nobody understands Quantum Mechanics.