插画不应该只是装饰文本；它们应该扩展文本。

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

"Children need to know that it's okay to be different."

每一个优秀的数学家至少是半个哲学家，而每一个优秀的哲学家至少是半个数学家。

仁就是爱人，以亲近自己的亲族为最重要；义就是适宜，以尊重贤能的人为最重要。