主动管理在成本前是负和游戏，在成本后是输家的游戏。
Active management is a negative-sum game before costs and a loser's game after costs.
数学中的每一个问题都是学习新东西的机会。
过去是一种幻觉，未来是一个谜，现在是一份礼物。
如果一个人只希望幸福，这很容易实现；但我们希望比别人更幸福，这总是困难的，因为我们相信别人比他们实际更幸福。
书是一面镜子：如果一只猿猴往里看，使徒不太可能往外看。
Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.