Perhaps no book was more central to medieval spirituality and mysticism," writes Bernard McGinn, "or more problematic to contemporary readers, than the Song of Songs. . . Lingering Victorian attitudes towards the opposition between sex and religion find the Song's frank erotic language embarrassing and even distasteful." But in the twelfth and early thirteenth centuries, the Song of Songs was a favorite book of Cistercian monks. Bernard of Clairvaux,...