生活的目的不是快乐。它是有用的，是光荣的，是富有同情心的，是让你活得有意义并且活得好。
The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.
It is not enough to observe and experiment, theorize and calculate. One must also imagine.
国际体系的结构迫使国家以某种方式行事，无论其内部特征如何。
做数学的艺术在于找到那个包含所有普遍性萌芽的特殊案例。
The novel is a mirror walking down the road.
元素周期表是人类好奇心和创造力的证明。
惟有变化才是永恒的。