“我为什么要让他决定我的行为?" You don't need to care if you can bring happiness to a newpaper vendor who is not necessarily your source of happiness. but you care about those people related to you. You want to see your boss satisfied with your hardwork. You want to see your contribution to your family makes your beloved ones happy, don't you?! You don't share a key with a newspaper vendor, but a lot of time you share one of the keys with you family, your colleagues and boss. The first story tells us: don't expect your keys will open all the doors,