人需要经历痛苦。经历痛苦后，人就会变得强大。

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

数学中最深刻的思想往往源于最简单的观察。

The deepest wounds are often invisible to the naked eye.

商业中最强大的工具是一个执行得当的简单想法。