All stories — true or fictional — will include one or more of Plato's functions, and they will therefore change us. We will believe, do, think, know or feel something we didn't before.
The last sentence nails the reason why I love reading so much. From Monkeys with Typewriters by Scarlett Thomas. A book about writing, that explains everything from Plato to Toy Story. I'm currently halfway through and well, since I'm a big fan of everything from Thomas, it's no surprise I'm loving it so far.