世界上到处都是会告诉你你不能做什么的人。你必须做的是找到那些会告诉你你能做什么的人。

Liberty cannot be preserved without a general knowledge among the people.

Happiness is holding someone in your arms and knowing you hold the whole world.

Theorems are the permanent literature of mathematics.

史记

The only way to learn mathematics is to do mathematics.

当一件事有趣时，探寻其中隐藏的真相。