"one thing that I realized early on in thinking about this book, when I found, to my consternation, that I was writing a fantasy. I hadn't expected ever to write a fantasy, because I am not a great fantasy fan. But I realized that I could use the apparatus of fantasy to say things that I thought were true. Which was exactly what, I then realized, Milton had been doing with Paradise Lost. Paradise Lost is not a story of people and some other people who've got wings. It's not one of those banal fantasies that just rely on somebody having magic and someone dropping a ring down a volcano. Paradise Lost is a great psychological novel that happens to be cast in the form of a fantasy, because the devils and the angels are, of course, embodiments of psychological states. The portrait of Satan, especially in the Temptation scene (I think it's in Book 9), is a magnificent piece of psychological storytelling.