"Books are the keys to unlocking our understanding of others."

It is a far, far better thing that I do, than I have ever done; it is a far, far better rest that I go to than I have ever known.

宽容的力量比暴力的力量更强大。

I never write Metropolis for seven cents because I can get the same price for city. I never write policeman because I can get the same money for cop.

The concept of infinity is not just a mathematical abstraction, but a physical reality.