“I'm smart enough to know that I'm dumb.”

“People often think I'm a faker, but I'm usually honest, in a certain way--in such a way that often nobody believes me!”

“It doesn't make a difference how beautiful your guess is. It doesn't make a difference how smart you are, who made the guess, or what his name is. If it disagrees with experiment, it's wrong.”

“Everything is interesting if you go into it deeply enough”

“Tell your son to stop trying to fill your head with science — for to fill your heart with love is enough. ”

“We can't define anything precisely. If we attempt to, we get into the paralysis of thought that comes to philosophers... one saying to the other: you don't know what you are talking about! The second one says: what do you mean by talking? What do you mean by you? What do you mean by know?”

“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!”