It is the facts that matter, not the proofs. Physics can progress without the proofs, but we can't go on without the facts ... if the facts are right, then the proofs are a matter of playing around with the algebra correctly.

But logic is not all, one needs one's heart to follow an idea.

I, a universe of atoms, an atom in the universe.

A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.

It is not unscientific to make a guess, although many people who are not in science think it is.

I'm going to play with physics, whenever I want to, without worrying about any importance whatsoever.

There is a computer disease that anybody who works with computers knows about. It's a very serious disease and it interferes completely with the work. The trouble with computers is that you 'play' with them!