"When we know how to do something, we don't call it research anymore."

"I don't know what's the matter with people: they don't learn by understanding; they learn by some other way — by rote or something. Their knowledge is so fragile!"

"The world is a dynamic mess of jiggling things."

"Mathematics is not a science, but a language. It's a tool for science."

"I would often go to these conferences where they would talk about the ultimate theory, and I would always say, 'What's the ultimate experiment?'"