If you've ever felt a strange sense of sadness or alienation, there's a potential way out of the confusion- just shift this feeling into a sense of purpose. It's not about happiness, although happiness often results from doing something you love. Instead, it's about challenge and fulfillment, finding the perfect combination of striving and achievement that comes from reaching a big goal.
The lesson, as he explains it: 'If I fail more than you do, I win. Built into this notion is the ability to keep playing. If you get to keep playing, sooner or later you're gonna make it succeed. The people who lose are the ones who don't fail at all, or the ones who fail so big they don't get to play again.
If you're doing something you love, it doesn't matter that it's challenging. You can keep going for a long time as long as you're motivated- just make sure you choose the right starting point. If you're lucky, as happened with Stephen, Your inclination may even become a vocation.