飞蓬生长在麻地里，不用扶持也能挺立；白沙混进黑色泥土，也会跟着一起变黑。

The world is full of people who have dreams and the world is full of people who have ideas, but the world is also full of people who never do anything about them.

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.