"The only true voyage of discovery, the only fountain of Eternal Youth, would be not to visit strange lands but to possess other eyes, to behold the universe through the eyes of another, of a hundred others, to behold the hundred universes that each of them beholds."

No man really knows about other human beings. The best he can do is to suppose that they are like himself.

理论计算机科学是一个领域，其中深刻的数学见解导致了实用的计算工具。