A shuttle picked us up from the train in Chappaqua, N.Y. The driver was intent on getting us to the retreat center, racing through several small upper N.Y. townships a tad too fast. It was the opening of the Creating Change Through Family Philanthropy Retreat run by Resource Generation, and to the driver it was obviously not to be missed. Along the empty tree-lined streets, we passed only one solitary figure trundling along the edge of the half-paved road. That brief glimpse was my...