Every problem in mathematics is an opportunity to learn something new.
可持续性不是一个流行词，而是对后代的承诺。
A novel is a mirror walking along a main road.
Democracy... while it lasts is more bloody than either aristocracy or monarchy. Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself. There is never a democracy that did not commit suicide.
The greatest leader is not necessarily the one who does the greatest things. He is the one that gets the people to do the greatest things.