Don’t say anything about someone in email you would not be comfortable saying to them directly, because eventually they will read it.
If you think about something at three o'clock in the morning and then again at noon the next day, you get different answers...
The process of solving a mathematical problem is often more important than the solution itself.
腐蚀青年最可靠的方法就是教导他尊重那些思想相同的人,而不是那些思想不同的人。
比喻贪心不足,终将自食恶果。