"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!"

"I have a friend who's an artist and has sometimes taken a view which I don't agree with. He'll hold up a flower and say, 'Look how beautiful it is,' and I'll agree. Then he says, 'You see, as a scient…"

"The great thing about science is that it's a way of not fooling yourself."

"There are no miracles, only wonders."

"I don't have to follow rules. I just have to find out what's true."