I know that I am intelligent, because I know that I know nothing.

Let us permit nature to have her way. She understands her business better than we do.

I am fond of pigs. Dogs look up to us. Cats look down on us. Pigs treat us as equals.

The truths of religion are never so well understood as by those who have lost the power of reason.

I'm not as famous as Stephen Hawking, but certainly in the U.S., I have a very high profile for a scientist. It is an awesome responsibility, one that I don't shoulder lightly.