These thoughts were as familiar to her, and as comforting…

““These thoughts were as familiar to her, and as comforting, as the precise configuration of her knees, their matching but competing, symmetrical and reversible, look. A second thought always followed the first, one mystery bred another: Was everyone else really as alive as she was? For example, did her sister really matter to herself, was she as valuable to herself as Briony was? Was being Cecilia just as vivid an affair as being Briony? Did her sister also have a real self concealed behind a breaking wave, and did she spend time thinking about it, with a finger held up to her face? Did everybody, including her father, Betty, Hardman? If the answer was yes, then the world, the social world, was unbearably complicated, with two billion voices, and everyone’s thoughts striving in equal importance and everyone’s claim on life as intense, and everyone thinking they were unique, when no one was. One could drown in irrelevance. But if the answer was no, then Briony was surrounded by machines, intelligent and pleasant enough on the outside, but lacking the bright and private inside feeling she had. This was sinister and lonely, as well as unlikely. For, though it offended her sense of order, she knew it was overwhelmingly probably that everyone else had thoughts like hers. She knew this, but only in a rather arid way; she didn’t really feel it.””

— Ian McEwan