数学是一门活生生的学科，随着新思想的出现而不断发展。

We are all prisoners of our own minds.

Sometimes it seems as if there are more solutions than problems. On closer scrutiny, it turns out that many of today's problems are a result of yesterday's solutions.

In mathematics, the journey of discovery is often more rewarding than the destination itself.

容易愤怒就会伤害别人；私欲太多了就会害了自己；贪图安逸就会有害于自己的品德；忧虑太多，就会削弱自己的意志。