"I feel that if a man has a problem, it's not solved unless he understands it."

"I actually did not have to learn a thing for my thesis. It was all stuff I already knew."

"The world is a stage, but the play is badly cast."

"If you think you understand quantum mechanics, you don't understand quantum mechanics."

"You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... So let's look at the bird and see what it's doing…"