这就好像口渴了才挖井，人死了才找医生。 

生活对我们任何人来说都不容易。但那又怎样？我们必须有毅力，最重要的是对自己有信心。

Grief is like the ocean; it comes on waves ebbing and flowing. Sometimes the water is calm, and sometimes it is overwhelming. All we can do is learn to swim.

口是伤人斧，言语锐如刀，语言的力量巨大，学会好好说话。  

There is no true liberty without the liberty of thought.

自守表示的研究是数学抽象深度的反映。