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

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

The electron is a theory. But the theory is so good we can almost consider them real.

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

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.

It is our responsibility as scientists, knowing the great progress which comes from a satisfactory philosophy of ignorance, the great progress which is the fruit of freedom of thought, to proclaim the value of this freedom; to teach how doubt is not to be feared but welcomed and discussed; and to demand this freedom as our duty to all coming generations.

Nobody ever figures out what life is all about, and it doesn't matter. Explore the world. Nearly everything is really interesting if you go into it deeply enough.