Cyan comments on Your Strength as a Rationalist - Less Wrong
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The fact that something is really written is true; whether it implies that the written statements themselves are true is a separate theoretical question. Yes, ideally you'd want to take into account everything you observe in order to form an accurate idea of future expected events (observable or not). Of course, it's not quite possible, but not for the want of motivation.
Well I didn't think I needed to clarify that I'm not questioning whether or not something that's written is really written. Of course, I'm questioning the truthfulness of the actual statement.
Or not so much it's truthfulness, but rather whether or not it can be considered evidence. Though I realize that you take issue with arguing over word definitions, to me the word evidence has certain meaning that goes beyond every random written sentence, whisper or rumor that you encounter.
Around these parts, a claim that B is evidence for A is a taken to be equivalent to claiming that B is more probable if A is true than if not-A is true. Something can be negligible evidence without being strictly zero evidence, as in your example of a fairy story.