唯一真正重要的是你在世界上产生的影响。
The only thing that is truly important is the difference you make in the world.
The best way to cheer yourself up is to try to cheer somebody else up.
政策变化的影响往往比简单的经济模型所暗示的更为微妙。
人们不买你做什么，他们买你为什么做。
What I regret most in my life are failures of kindness.
