时间在被小齿轮滴答作响时是死的；只有当钟停止时，时间才会复活。
Time is dead as long as it is being clicked off by little wheels; only when the clock stops does time come to life.
先读经书，再读史籍，以经论史，评论古人史事，就不会与圣贤相悖；研读史籍，再温经书，以史证经，读书目的升华，决不仅为章句之学。
Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
唯一存在的限制是你给自己设定的限制。
The strength of a nation lies in the unity of its people.