I often re-read books. I've read all of the Harry Potter books countless times, Anne of Green Gables, Jane Eyre, Little Women, Pride and Predjudice, Karin Slaughter's Atlanta series and hundreds of others. I find that I often enjoy a book more the second time around. I would find it very, very difficult if I was told I could never read any of these books again. In fact, if I could choose between only reading old books again and getting to read new books I think I would have to go with my old favourites.