The proof of a system's value is its existence.
系统价值的证明是它的存在。
The more you know, the more you realize you don't know.
才华和优雅如果掌握得有分寸，总在一个人的举止和谈吐中被人觉察到，但是无需炫示出来。正像不必把你的帽子、裙子和缎带一下都穿戴上，为的是让别人知道你拥有这些东西。
We are not victims of our circumstances. We are products of our decisions.
You can pay for school but you can't buy class.
成功不需要高学历，你需要的是胆识和常识。
坚持是数学研究的关键，许多伟大的成果来自于长期的奋斗。