"I have been reading Lady Julian of Norwich," declares C.S. Lewis in a letter to his former pupil, the Benedictine mystic Bede Griffiths. "A dangerous book, clearly. I'm glad I didn't read it much earlier." Thomas Merton wrote simply, "There can be no doubt that Julian is the greatest of the English mystics." Few texts have had held such interest or been the object of such enduring devotion as has Julian of Norwich's 14th-century classic A...