当你停下来思考你是否爱一个人时,你已经永远停止爱那个人了。
The moment you stop to think about whether you love someone, you've already stopped loving that person forever.
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.