年轻时,你以为世界是一个可以随心所欲生活的地方。但随着年龄增长,你意识到世界是一个你必须按照必须的方式生活的地方。
The happiness of a married man depends on the people he has not married.
The best way to learn mathematics is to do mathematics.
I don't care what people say about me, I know who I am.