"We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on."
"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... So let's look at the bird and see what it's doing -- that's what counts."
"Science is like sex: sometimes something useful comes out, but that is not the reason we are doing it."
"If you thought that science was certain - well, that is just an error on your part."
"We are trying to prove ourselves wrong as quickly as possible, because only in that way can we find progress."
"The first principle is that you must not fool yourself and you are the easiest person to fool."