We cannot always assure the future of our friends, but we have a better chance of assuring our future if we remember who our friends are.

Combinatorics is like the art of counting without actually counting.

当我退役的时候，我希望回头看我走过的路，每一天，我都付出了我的全部。

古代的学者，为自己才学不高而担忧，就发奋学习，迎头赶上；现在的文士，为自己才学不高而羞愧，就隐满短处，避忌批评。