Long ago, the story goes, Brigid flung out her mantle over the world. Beneath its shelter, the Earth and its people could find healing, insight, and growth. This legend, shared by both Celtic Pagans and Celtic Christians, makes the point that a mantle is not a box, a small rigid container meant to keep some things inside while excluding others. Instead, a mantle is wide, flexible, inclusive. Using this as their central metaphor, the authors-one...