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.

The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

Everybody who reasons carefully about anything is making a contribution ... and if you abstract it away and send it to the Department of Mathematics they put it in books.

Mathematics is a language plus reasoning. It's like a language plus logic. Mathematics is a tool for reasoning.

I have a limited intelligence and I've used it in a particular direction.

What is not surrounded by uncertainty cannot be the truth.

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