I've probably put this in my blog a few times, but it strikes me every time I read it. Its the best part of philosopher C.S. Lewis's book The Great Divorce. The book is a fantasy, a metaphor to describe the differences between heaven and hell. The part in this book around The Red Lizard of Lust is the greatest parable for our lust and how we deal with it before God. This excerpt is worth the five minutes it takes to read it. I don't think you necessarily have to have the context for the book for it to make sense.