The most exciting moments in mathematics are when you see connections between things that seemed unrelated before.

读书不体验认识，就好像闪电照物，一点都抓不到；读书不能身体力行，就像水上行车、陆上行舟、一点用处都没有。

The past is a place of reference, not a place of residence.

你无法回到过去改变开始，但你可以从现在开始改变结局。