On whether literature can [should?] change the world, and being true to the story, Philip Pullman on What is the relationship between art and society? An argument I like: "Taking care of the tools also means developing the faculty of sensing when we're not sure about a point of grammar. We don't have to know infallibly how to get it right so much as to sense infallibly that we might have got it wrong, because then we can look it up and get it to work properly. Sometimes we're told that this sort of thing doesn't matter very much. If only a few readers recognise and object to unattached participles, for example, and most readers don't notice and sort of get the sense anyway, why bother? I discovered a very good answer to that, and it goes like this: if people don't notice when we get it wrong, they won't mind if we get it right. And if we do get it right, we'll please the few who do know and care about these things, so everyone will be happy".