The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.
"The world is a library of stories, and every person is a book."
数学的真正力量不在于它的复杂性，而在于它的简洁和优雅。
【释义】：在爱一个人时，也要看清对方的缺点；在憎恨一个人时，也要看到对方的优点。
The only defense against the world is a thorough knowledge of it.