科学家不对自然法则负责，但他的工作是找出它们如何运作。

If the people cannot trust their government to do the job for which it exists - to protect them and to promote their common welfare - all else is lost.

The way to make progress is to acknowledge ignorance.

"To live is the rarest thing in the world. Most people exist, that is all."

The first man who， having enclosed a piece of ground， bethought himself of saying 'This is mine，' and found people simple enough to believe him， was the real founder of civil society.