数学中最深刻的发现往往来自于对最基本假设的质疑。

To turn caring into action, we need to see a problem, see a solution, and see the impact. But complexity blocks all three steps.

The task of the teacher is to lead the student from the known to the unknown.

每本书都是一句引文；每座房子都是从所有森林、矿山和采石场中引用的；每个人都是从他所有祖先中引用的。

心理现象最好从其功能角度来理解。