在科学问题上，一千个人的权威抵不上一个人的谦卑推理。

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。

I define nothing. Not beauty, not patriotism. I take each as it comes, and I leave it as it goes.

Was everyone else really as alive as she was?... If the answer was yes, then the world, the social world, was unbearably complicated, with two billion voices, and everyone’s thoughts striving in equal importance and everyone’s claim on life as intense, and everyone thinking they were unique, when no one was. One could drown in irrelevance.

所以,储备是国家最重要的事；粮食是国家的宝物；武器是国家的利爪；城池是守卫国家的屏障。