In one of the most famous passages of the New Testament, the apostle Paul writes to the Christians of Corinth, employing a complicated series of metaphors on the theme of transformation: from childhood to adulthood, from ignorance to knowledge, from sinfulness to a state of grace. “When I was a child, I spake as a child, I understood as a child, I thought as a child,” the epistle runs, in the memorable rhythms of the King James Version. “But when I became a man, I put away childish things. For now we see through a glass, darkly; but then face...