This was undoubtedly one of the most difficult books I've ever read. The only way I made it through was by making copious notes in the margins, and going very slowly. The book got quite a bit easier after Williams began discussing the Commedia, but this is probably because I am familiar with the Commedia and not with Dante's earlier works. This book was truly great on every level. As a commentary on Dante it was superb. As a work of philosophical theology, it was challenging. And it was, to my surprise, a great devotional book on marriage as well.