人是万物的尺度：对于存在的事物，它们存在；对于不存在的事物，它们不存在。
一个力学问题只有被简化为代数问题时才算解决。
一句话，先是太胆小，明知错的事却不敢不做；后来也还是太胆小，明知对的事却不敢去做。
We are all born with a certain package. We are who we are: where we were born, who we were born as, how we were raised. We're kind of stuck inside that person, and the purpose of civilization and growth is to be able to reach out and empathize a little bit with other people.
To me, fearless is not the absence of fear. It's not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them.
出自《海国图志》。不管是东海还是西海，圣人各出自不同地方但是心理是相同的。
The longer I am out of office, the more infallible I appear to myself.