The process of solving a mathematical problem is often more important than the solution itself.

"A story is not a line; it is a web."

饥饿的时候就不惜妄取以保存性命，吃得很饱的时候又用虚伪的行为来粉饰自己。 

不自律的人是没有自由的。

无知，是一切罪恶的根源。