All men have the stars， but they are not the same things for different people。 For some， who are travelers， the stars are guides。 For others they are no more than little lights in the sky。 For others， who are scholars， they are problems。 For my businessman they were wealth。 But all these stars are silent。 You – you alone – will have the stars as no one else has them.

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。

变化是宇宙中唯一不变的东西。

"الحب هو أن تعطي دون أن تنتظر أي شيء في المقابل."