Can some explain what this quote means from the novel The Atonement by Ian Mcewan. I need it ASAP its due today.
"[Briony] felt foolish, appearing to know about the emotions of an imaginary being. Self-exposure was inevitable the moment she described a character's weakness; the reader was bound to speculate that she was describing herself... Only when a story was finished, all fates resolved and the whole matter sealed off at both ends so it resembled, at least in this one respect, every other finished story in the world, could she feel immune.”