悲观主义者在每个机会里看到困难。乐观主义者在每个困难里看到机会。
Psychology must be based on direct experience and introspection.
The arithmetic of modular forms is a key to understanding the deeper structures of number theory.
尽人事,听天命,心态平和最重要。  
真相并不总是美丽的,但寻找真相的过程是。