Science is a way of thinking much more than it is a body of knowledge.

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

数学中最重要的是理解概念，而不仅仅是记忆公式。

You don't learn to walk by following rules. You learn by doing, and by falling over.

记忆不仅是个人的事情，也是集体的事情。

黄芩（唾手可得）没有造假，阿魏（稀有昂贵）容易造假。