Equality is not just a moral imperative; it’s an economic necessity.

Life is composed of lights and shadows,and we would be untruthful,insincere,and saccharine if we tried to pretend there were no shadows.

The world is a book, and those who do not travel read only one page.

数学家最好的作品是艺术，一种高度完美的艺术，像想象的最秘密的梦想一样大胆，清晰而透明。