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 TarttI had the epiphany that laughter was light, and light was laughter, and that this was the secret of the universe.
Donna TarttAre you happy here?" I said at last. He considered this for a moment. "Not particularly," he said. "But you're not very happy where you are, either.
Donna TarttFrom the window, above the clatter of pots and the slamming of cabinets, Francis was singing, as though it was the happiest song in the world: 'We are the little black sheep who have gone astray . . . Baa baa baa . . . Gentlemen songsters off on a spree . . . Doomed from here to eternity . . .
Donna Tartt