质量不是一时的风尚;它是一种哲学。
数学中最令人兴奋的时刻是当你发现两个看似不相关的领域有着深刻的联系。
The truth is, the past is all we have. We can't change it, but we can learn from it.
The only thing to do with good advice is to pass it on. It is never of any use to oneself.