Epistemic justification is a "required" part of the formula because it happens. It is whichever method we use to distinguish belief from knowledge. It's not something we have to seek out, to deliberately make beliefs knowledge--we're going to do it whether we think about it or not. It's a part of us.Doesn't that just make the whole thing boil down to "knowledge is whatever someone is convinced is true"?
I read it in a history book and see it in old photographs that Adolph Hitler had a moustache. Someone mentions it, and the claim of knowledge is evident. But I also read it a historical fiction that Hitler was actually blind and faked his way through the entire conquest of Poland. One is convincing. Why is one more believable? It takes barely a thought to see that one is a fiction book and one is a non-fiction book.
You are correct that in the formula "justified true belief," truth is ontological. We do know ontological truths, from the reality of the solidity of the ground beneath our feet to the abstract addition of two plus two equalling four. Ontological truth isn't a stranger to us. It doesn't need to be "considered" to be true--more often we take it for granted (don't consider it at all).What is your take on the "true" part of the definition? This seems to be even harder to quantify. Obviously, knowledge is something someone considers to be true. But the definition "justified, true belief" seems to imply that the claim must actually be true. If that's the case, how is that determined? If it's simply up to the person who is claiming knowledge to decide that it is true, it again just seems pointless to include.
My take is that it's in us to instinctively and habitually make the truth judgement, and that it never fails to be wrong. I can hear the wails of protest, but hear me out. Truth is "what is" here and now. The relation between epistemology (believing/knowing) and ontology (what is) is integral--you don't have one without the other. We each have a unique data set of knowledge particular to us, stored in memory, and each moment of time, each "take" of the world, presents us with a unique data set of "what is" to know and remember/record. So when you say we must decide if it's true--no, we don't have to. That judgement call is made the moment reality hits us in the face. It's made beneath the surface, where whales reside, and our role is just to become aware of it.
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