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.

一件事情都不能做到有始有终，就不要去操持其他的事情;一物也不明白，就不要追求博闻广记。

事实是，我们都能够做出可怕的事情。但我们也能表现出极大的善意。

如果你发现自己在想 "咦，我的好刀呢？”或者“我的好笔在哪里？" 这意味着你有的是坏的东西。把坏的扔掉吧。