抽象的目的不是模糊，而是创建一个新的语义层次，在这个层次上可以绝对精确。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
A theory should not attempt to explain all the facts, because some of the facts are wrong.
追求卓越是一段旅程，而不是终点。