It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong.

There is no learning without having to pose a question. And a question requires doubt.

If you can find any other view of the world which agrees over the entire range where things have already been observed, but disagrees somewhere else, you have made a great discovery.

You know how it always is, every new idea, it takes a generation or two until it becomes obvious that there's no real problem. It has not yet become obvious to me that there's no real problem. I cannot define the real problem, therefore I suspect there's no real problem, but I'm not sure there's no real problem.

It turns out that all life is interconnected with all other life.

I am not interested in what today's mathematicians find interesting.

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