I think it's especially important for an editor to say what he's enjoying. For a novelist to be told, midstream, what he's doing right can actually influence the unwritten parts of a novel in a positive way - praise helps a writer know what's good about what he's written, what's interesting and exciting, and what to work for in writing the conclusion.
Donna TarttWho cares? If he is good to you? None of us ever find enough kindness in the world, do we?
Donna TarttThe first duty of the novelist is to entertain. It is a moral duty. People who read your books are sick, sad, traveling, in the hospital waiting room while someone is dying. Books are written by the alone for the alone.
Donna Tartt