The improvement of understanding is for two ends: first， our own increase of knowledge； secondly， to enable us to deliver that knowledge to others.
理解的提高有两个目标：首先，我们自己的知识增长；其次，使我们能够将这些知识传递给他人。
压力是一种特权——它只属于那些赢得它的人。
Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
每个角色内心都有一个世界，只要你看得足够仔细。