Happiness in this world, when it comes, comes incidentally. Make it the objet of pursuit, and it leads us a wild-goose chase, and is never attained. Follow some other object, and very possibly we may find that we have cought happiness without dreaming of it.

The search for reciprocity laws is a fundamental theme in the history of mathematics.

"To read is to travel without moving, to live a thousand lives in one."

要将一个国家从最低级的野蛮状态带到最高度的富裕，所需的几乎只有和平、低税收和较为合理的司法管理。

信任是每一段牢固关系的基础，无论是与员工、客户还是合作伙伴的关系。