你对别人越感兴趣，别人就对你越感兴趣。要想变得有趣，先有兴趣。
The more you are interested in others， the more interesting they find you. To be interesting， be interested.
People, even more than things, have to be restored, renewed, revived, reclaimed, and redeemed; never throw out anyone.
一个好的数学家总是准备好进行概括。
Civilization will not last, freedom will not survive, peace will not be kept, unless a very large majority of the people unite to defend them.