Government, even in its best state, is but a necessary evil; in its worst state, an intolerable one.
Happiness is a state of mind, not a set of circumstances.
Every challenge is an opportunity in disguise—if you're willing to look for it.
每一个失败的实验都是迈向成功的一步，只要你从中学习。
No individual has any right to come into the world and go out of it without leaving behind him distinct and legitimate reasons for having passed through it.