年轻时你以为会有很多朋友。但随着年龄增长，你意识到一只手就能数得过来。
When you're young you think you're going to have lots of friends. But as you get older, you realize you can count them on one hand.
If you want to live a happy life, tie it to a goal, not to people or things.
历史不是过去，而是一张从特定视角绘制的地图，对现代旅行者有用。