穷人的真正悲剧在于他们除了等待富人给予他们一些东西外，什么也做不了。
The real tragedy of the poor is that they can do nothing but wait for the rich to give them something.
The study of mathematics is a constant dialogue between the concrete and the abstract.
预测未来的最好方法就是创造未来。
【译文】 叶公问子路：孔子是怎样的人，子路不回答。孔子说：“你怎么不说：他这个人啊，发愤学习就忘记吃饭，高兴起来就忘记了忧愁，不知道快要变老了等等？”
We don't even know how strong we are until we are forced to bring that hidden strength forward. In times of tragedy, of war, of necessity, people do amazing things. The human capacity for survival and renewal is awesome.
光以为它比任何东西都快，但它错了。无论光跑得多快，黑暗总是先到一步，并在那里等着它。