当且仅当所有投资者都持有均值-方差有效的投资组合时，市场组合才是有效的。

任正非内部讲话稿

人的生命是有限的，但为人民服务是无限的。

I try to approach each project as if it's my first.

Every day confirms his belief of the inconsistency of all human characters, and of the little dependence that can be placed on the appearance of merit or sense.

写作是一种勇气，面对自己的恶魔。