Why is the past perfect used in these cases? This is from George Orwell's Nineteen Eighty-Four.
Winston had seen O'Brien about twelve times in almost as many years. Years ago he had dreamed about O'Brien. He was in a dark room and O'Brien had said to him, We shall meet in the place where there is no dark. Winston didn't know what that meant, but he was sure it would happen, one day.