心灵是自己的地方，它本身可以把地狱变成天堂，把天堂变成地狱。

A failure is not always a mistake, it may simply be the best one can do under the circumstances. The real mistake is to stop trying.

函数的概念在数学中是基础的，而λ演算提供了一种形式化这一概念的方法。

数学是宇宙书写的语言。

"In the end, we will remember not the words of our enemies, but the silence of our friends."

自由是通过实践养成的习惯。