Everything is hard before it is easy. The day before something is a breakthrough， it’s a stupid idea.

"Every word carries the weight of its history."

The beauty of mathematics is that it is both an art and a science.

顾客可能不总是对的，但他们永远是顾客。

自由之树需要经常用爱国者和暴君的鲜血来浇灌。

不可能与可能之间的区别在于一个人的决心。