What I want to talk to you about today is the difference between gifts and choices. Cleverness is a gift， kindness is a choice. Gifts are easy -- they're given after all. Choices can be hard. You can seduce yourself with your gifts if you're not careful， and if you do， it'll probably be to the detriment of your choices.

科学是对经验的系统分类。

假如一个女人爱上了一个男人，只要女方不故意瞒住男方，男方一定会看得出的。

Mathematics is the music of reason.

Leadership is not about being in charge. It's about taking care of those in your charge.

"The world is a book, and those who do not travel read only one page."

你越具体，你就越普遍。