好的研究就像好的故事——有开头、中间和结尾，逻辑连贯。

市场是供需平衡的反映。

It is remarkable that a science which began with the consideration of games of chance should have become the most important object of human knowledge.

The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.