The only way to learn mathematics is to do mathematics.
读古人的著作,与贤能的人交往,最忌讳轻率地表示附和赞同,也不能够轻率地表示异议。之所以会犯这两种过失,都是由于心中缺乏主见,做学问时就掺杂有趋炎附势的成分,不是曲意逢迎便是虚伪矫饰。
The truth is always exciting. Speak it, then. Life is dull without it.
衡量一个人的真正标准是他如何对待那些对他毫无益处的人。
The biggest lesson I've learned is to trust yourself.