最好的投资机会往往出现在不确定的时期。

Three things are necessary for the salvation of man: to know what he ought to believe； to know what he ought to desire； and to know what he ought to do.

I'm not perfect, but I'm always me.

Every experiment, whether successful or not, is a step toward understanding.

一个人不能欺骗任何人，甚至不能欺骗世界的胜利。

教育学中的实验方法不仅是研究的工具，更是理解教育过程的基本原则。