"I don't think I'm a very good teacher. I just try to explain things clearly."

"I don't need a theory, I just want to know what the hell is going on."

"The highest forms of understanding we can achieve are laughter and human compassion."

"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…"

"The thing that bothered me about it was that I was doing work for the military, and I didn't like that."