最简单的图画往往能承载最深刻的情感。
The best arguments in the world won't change a person's mind. The only thing that can do that is a good story.
The most important part of teaching is to teach what it is to know.
一本书是世界的一个版本。如果你不喜欢它,忽略它;或者提供你自己的版本作为回报。
I like to think of mathematics as a kind of poetry.