How Do We Find the Motivation to Keep Going?

If happiness came from acquiring things and success, then the richest people would be the happiest. And what I see is the inverse that richest, most successful people I know are the unhappiest. As a result of this understanding, we don't just withdraw from the world and sit in bed all day long thing. We cease using the world in service of our own happiness. Instead, we use our own happiness in service of the world.