有两种和平的暴力,那就是法律和礼节。
There are two kinds of violence of peace, that is the law and etiquette.
The most exciting moments in mathematics are when you realize that two seemingly unrelated areas are deeply connected.
最难解释的是每个人都决定不去看的明显事实。
预测未来的最好方法就是创造未来。
自由不是礼物,而是必须每天争取的成就。