Often the people closest to us escape our notice. An old classmate of mine from the Harvard Business School recently surfaced with a simple but profound message that instantly clarified an issue I’ve been pondering all year - what motivates the dedicated people who toil tirelessly in the nonprofit world? The message was unusual coming from a business school graduate. After all, most of my Harvard classmates went on to become captains of industry focused on making money for themselves and their stockholders. And, for the most part, they were pretty good at it.