数学的本质在于它的自由。
The essence of mathematics lies in its freedom.
Education begins the gentleman, but reading, good company and reflection must finish him.
The dangerous man is the one who has only one idea, because then he'll fight and die for it.
阅读之于心灵,犹如运动之于身体。
译文:长久治理百姓的人,以道德为屏障。
The best music comes from the heart.