The measure of intelligence is the ability to change.
The old believe everything; the middle-aged suspect everything; the young know everything.
学习数学的唯一方法就是做数学。
保持真实,永远不要让成功改变你是谁。
人活在世上只是过客,如果离开人世也没让你最疼爱的人,知道你是谁,是很可悲的事情。