"The more you learn, the more you realize how much you don't know."

"The only way to do great work is to love what you do."

"The thing that I cannot understand is what I cannot create. And I can't create a universe. So I don't understand the universe."

"Our imagination is stretched to the utmost, not, as in fiction, to imagine things which are not really there, but just to comprehend those things which are there."

"The only way to do something is to do it. Not to talk about it, not to plan it, but to do it."