The greatest tragedy is the tragedy of the common man.
数学是提出正确问题然后找到答案的艺术。
一本好书应该是劈开我们内心冰海的斧头。
Your most unhappy customers are your greatest source of learning.
I want to run a good race, to run a good time, and to enjoy it.
The best time to plant a tree was 25 years ago. The second best time is today.