The act of writing is an act of courage.

市场是经济周期的反映。

The only person you should try to be better than is the person you were yesterday.

生活是世界上最罕见的事情。大多数人只是存在，仅此而已。

做出伟大工作的唯一途径就是热爱你所做的事。

自然是用数学语言写的。