Letters, Roland discovered, are a form of narrative that envisages no outcome, no closure. His time was a time of the dominance of narrative theories. Letters tell no story, because they do not know, from line to line, where they are going. . . . Letters, finally, exclude not only the reader as co-writer, or predictor, or guessor, but they exclude the reader as reader; they are written, if they are true letters, for a reader.
— A. S. Byatt, Possession