当课堂只追求“有趣”，知识就失去了厚度。

We're flooding people with information. We need to feed it through a processor. A human must turn information into intelligence or knowledge. We've tended to forget that no computer will ever ask a new question.

没有比哲学家更无畏的航海者了。

Who can afford to do professional work for nothing?

自守表示的研究是数学知识统一性的反映。