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.
"Great lives are like great novels - they have plot twists, character development, and moments of sheer poetry."
技术可以放大优秀教学的效果，但无法替代糟糕的教学。
We make things to remember, and we remember by making things.
"The only true voyage of discovery, the only fountain of Eternal Youth, would be not to visit strange lands but to possess other eyes, to behold the universe through the eyes of another, of a hundred others, to behold the hundred universes that each of them beholds."