If you think you understand it, that only shows that you don't know the first thing about it.

There are some things so serious you have to laugh at them.

When we measure something we are forcing an undetermined, undefined world to assume an experimental value. We are not measuring the world, we are creating it.

No paradox, no progress.

Anybody who is not shocked by this subject has failed to understand it. [of quantum mechanics]

Of course I don't believe in it [pointing to horseshoe on his office wall]. But I understand that it brings you luck whether you believe in it or not.

A physicist is just an atom's way of looking at itself.