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.
有谁背后没被他人议论过，又有谁在他人面前没议论过别人？有钱人不管说什么，别人都奉承他说的是真的，而穷人即使说的是真话，别人也都不相信是真话。
给我一个英雄，我会给你写一个悲剧。
The tyranny of a prince in an oligarchy is not so dangerous to the public welfare as the apathy of a citizen in a democracy.
Sustainability is not just about planting trees; it's about planting ideas that grow into actions.