"I have a lot of fun. I've always had a lot of fun. I don't know why I should stop."

"You have no responsibility to live up to what other people think you ought to accomplish. I have no responsibility to be like what they expect me to be. It's their mistake, not my failing."

"I was brought up to believe that the only way to really understand something is to build it."

"Physicists are like little children, they want to know how the world works. But they're not content to just wonder. They want to open up the toy and see what's inside."

"I don't know anything, but I do know that everything is interesting if you look at it deeply enough."