When I began writing Passion & Purpose in 2009, I met Susan, a young woman on the brink of quitting her investment banking job to pursue her lifelong passion of starting a nonprofit. A year later, when I asked how her new venture was going, I was surprised to hear that she “couldn’t bring herself to quit” in the first place. And when we bumped into each other last week, I found her toiling away in exactly the same role, still dreaming of her nonprofit venture, but now more depressed than ever.