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。

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

We are all in the gutter, but some of us are looking at the stars.

没有人富有到可以赎回自己的过去。

统计学是从经验中学习的科学，尤其是从他人的经验中学习。

The search for meaning is a futile endeavor.

The Internet is a powerful tool for education, communication, and collaboration.

恐惧只是一种心态。