"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. You'll only know about humans in different places a…"

"I was never a very good student, and I always had trouble with math. I was always in the bottom of the class in math."

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

"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…"

"Study hard what interests you the most in the most undisciplined, irreverent and original manner possible."