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.
读书的时候不要只想作者怎么看，想想你自己怎么看。
The past is always tense, the future perfect.
The human being is always more than what he knows of himself.
The truth is a slippery thing, especially in the dark.
可持续性不仅仅是保护环境，更是创造一个对所有人都有利的系统。
创新不是目的，解决用户真实需求才是根本。