The great use of life is to spend it for something that will outlast it.

数学家是能在定理间找到类比的人；更好的数学家能在理论间看到类比；而最优秀的数学家能注意到类比之间的类比。

Learning is not a passive process; it involves the active construction of knowledge.

艺术不是你看到的，而是你让别人看到的。