书籍是镜子:你只能从中看到你内心已有的东西。
The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.  
"The more you experience, the more you learn."
The language of mathematics is universal, and it is through this language that we can communicate the most profound truths of the universe.
唯一真正的爱是对真理的爱。