看不见的手之所以常常看不见，是因为它常常不存在。
The reason that the invisible hand often seems invisible is that it is often not there.
定价的艺术不在于设定价格，而在于设计揭示真实价值的过程。
The spirit of moderation should also be the spirit of the lawgiver.
Curiosity drives the mathematician forward, always seeking the next question to answer.
The only way to write well is to write badly first.
