追求数学知识是一段永无止境的旅程，充满了无尽的好奇和惊奇。

过去总是紧张的，未来是完美的。

每个回声都包含着它所处空间的历史。

你必须对自己的能力有信心，然后足够坚强地坚持下去。

I’ve had to work very hard for every title. Nothing has been given to me.

未来属于那些今天种树的人。

Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.