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.

书本身不是目的，它是一种唤起的手段。

农业中的每一个挑战都是创新的机会。

The only thing I can rely on is my own perception, and that is always changing.

翻译：准备各种物资以充分利用，制成器具给天下带来利益，没有比圣人更伟大的了。