We always go back to the origin without knowing it. After meeting many people, you also met yourself. The "self" thing is invisible, hitting something else, what, bounce back, will understand "self". No matter where you run, you just end up running into yourself. 

人这一生总是会在不知不觉兜兜转转中又回到了原点。也许遇见了许多人后，也遇见了自己。"自己"这个东西是看不见的，撞上一些别的什么，什么，反弹回来，才会了解"自己"。无论你去哪里，你总是会遇见你自己。