Basically most stories told are one agent (the storyteller) acting against a “truth” of the told action (story), in order to tell her own “truth” (narrative). The author always lies in stories, because if there ever was a truth to begin with, it has to be manipulated for it to be a story, even when the intention is to come closer to the truth. In fact in order to come closer to the truth, the storyteller might need to disregard what’s true, since they cloud the truth that the reader is able to perceive. And more interesting, this truth-hybrid is then interpreted to become the readers perception of the basic truth, something that can be something quite different from any truth that existed before it.
Fiction has the sympathetic quality of being a lie that both the sender and receiver agree upon, and in so, isn’t a lie at all. If I would say: “In 2009 I was abducted by an alien spieces entirely made out of cheese” it would be a lie, but if instead I said: “Once upon a time I was abducted by an alien spieces entirely made out of cheese” you would most likely perceive it as a lousy joke (or something). It’s still not true, but it isn’t a lie either, it’s fiction.
By clearly stating “This isn’t true, it’s fiction,” we actually open up for the possibility of telling the truth, without having to lie about the details. It is also appearant that the truth best told through fiction isn’t the obvious kind, not the truths that can be grasped, or explained in a straight forward way, but instead must be felt, or thought about in a very non-straight forward way.
Fiction is a great tool for storytellers, since it actually keeps the storyteller from lying.