The natural effort of every individual to better his own condition， when suffered to exert itself with freedom and security， is so powerful a principle that it is alone， and without any assistance， not only capable of carrying on the society to wealth and prosperity but of surmounting a hundred impertinent obstructions with which the folly of human laws too often encumbers its operations.

快乐的人，只有快乐的人，是能把今天称为自己所有的那个人。

证明的目的是理解，而不仅仅是验证。

我不遵循规则。我制定规则。