C. S. Lewis's book tells us about one of the "excursions" that take place from time to time, from Hell to Heaven. Those souls who wish to participate can do so. The space shuttle comes and picks them up. And it takes them up to the outskirts of Heaven. With the purpose of seeing the place. And if they like it and want to, they can stay and continue further in. Of course, they will need to undergo a small "surgery" to remove any passion that makes their life Hell. (As well as what they consider their virtue.) They are, of course, free to avoid the "surgery" and return back. The tragic thing is that most souls prefer to return to Hell. The more receptive ones because they want to bring a little of their Hell to Heaven. They do not intend to detach Hell from themselves. They continue to be trapped in the passions they nurtured in this life. Although dehydrated - completely dreamlike - their old passions are their "content." They are afraid to sacrifice them... But it is not possible to marry Hell with Heaven. Hence the title of the book: "The Great Divorce."