Never risk more than you can afford to lose.
You don’t become a hero by being normal.
To be a writer is to be a spy on life.
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？”
数学的进步是通过它能解决的问题数量来衡量的。