No matter what he does， every person on earth plays a central role in the history of the world. And normally he doesn't know it.
无论他做什么，地球上的每个人在世界历史中都扮演着核心角色。而通常他并不知道这一点。
改变行为的唯一方法是通过操纵强化偶然性。
幸福不是相信我们不需要改变；而是意识到我们可以改变。
The greatest glory in living lies not in never falling, but in rising every time we fall.