如果你借了什么东西，试着在归还的时候把它变得比你借到时的状态更好。清洁它、打磨它、填充它。
If you borrow something， try to return it in better shape than you received it. Clean it， sharpen it， fill it up.
The interplay between quantum mechanics and general relativity is one of the most profound puzzles in modern physics, and solving it may require a complete rethinking of our understanding of the universe.
It is best to act with confidence, no matter how little right you have to it.
你能给孩子最伟大的礼物就是自尊的礼物。
I'm a perfectionist. I'm pretty much insatiable. I feel there's so many things I can improve on.
华德福方法的核心是教育是一门艺术——它必须与孩子的经验对话。要教育整个孩子，必须触及他的心灵和意志，以及头脑。
The study of L-functions is a journey into the hidden symmetries of the number field.