The thing about life is that you never know what's going to happen next.
Mathematics is the art of giving the same name to different things.
对变革的恐惧会扼杀进步,而理解变革能引导进步。
出自《论语·子罕》。年轻人是值得敬畏的啊,你怎么知道他之后不如当今的你呢?