I suppose the way to proceed is abandoning the notion there's a set of criteria which knowledge contains and disqualifies all else or change JTB, or change the philosophical definition of knowledge. It's a bit Gettierish, but saying all knowledge is JTB or Not would technically silence my objections. — Cheshire
Maybe this will help. The way I view things: There are two types of knowledge, the ideal, purely conceptual standard by which all practicable knowledge is appraised—I’ll call this “ontic knowledge”—and that which is within our capacity to hold and engage in—I’ll call this “subjective knowledge”. The former is that by which the latter is measured against as means of appraising the latter’s validity.
A leading issue with knowledge is with the notion of truth. To believe that something is is to believe ones notion/idea/conceptualization/etc. to be true (other types of belief are however possible). However, so doing, of itself, does not signify that any given belief of what is true is in fact true/accurate. In these statements there are two implicit concepts: in parallel, an ideal and conceptual understanding of truth—call it “ontic truth”, or the factual state of being wherein that believed accurately conforms to that which is real—and, secondly, our awareness-based appraisals of what is and is not true—call this “subjective truth”, or the subjectively, and sometimes tacitly, made appraisal that that which is maintained accurately conforms to that which is real. It might be subtle, but the two concepts are distinct.
Most implicitly interpret in JTB is the notion of ontic truth—which, by its very idealized property of being ontic, or factual, cannot ever be mistaken in any way. And it is this notion of ontic (factual) truth which brings about our ideal notion of ontic knowledge. Yet this can only be a conceptual model of that which is aspired for; that which “knowledge intends” as you’ve mentioned. Yet the knowledge in this latter statement is not the conceptual standard of ontic knowledge—which is ontically true belief that can thereby be justified upon request—but is, instead, the only form of knowledge that can be had in practice: subjective knowledge.
Subjective knowledge, then, can be defined as: a notion that is believed to be true and which can be justified at will in so being true. If that which is believed is in fact ontically true, then it will in deed accurately conform to that which is real. Yet this is where ontology plays a crucial role: Where that which is real is itself factually interconnected in coherent manners (for example: physics, chemistry, biology, and awareness are all coherently related in some manner—this despite our lack of full understanding regarding these coherent interconnection), then there will always be means of justifying that which is in fact real. Where contradictions are found in one’s justifications, for one example, this will then illustrate that one cannot account for what one believes to be true, for one cannot provide how it accurately conforms to what in fact is real.
The just stated would take a lot to unpack—particularly in regard to the nature of reality (an aspect of ontology) and to the nature of valid, ontology-contingent justification in general (an aspect of epistemology). Doubtless there would be much contested in any such account, but I yet find the overall relation to reality and to reality-contingent justification to be rather intuitively valid for most, if not all, people.
So there’s JTB, our conceptualized ideal form of knowledge (which cannot be had in practice unless one were to evidence one’s belief of what is true to be infallible); and there’s validly justifiable believed truth—I’ll term this JBT—the only form of subjective knowledge possible to hold in practice when lacking truths that have been demonstrated to be perfectly secure from all possible error (i.e., when lacking truths that have been infallibly demonstrated to so be).
Now, for all practical purposes, our knowledge that the sky is blue, as one example, is absolute (also that 1 + 1 = 2; etc.). But these instances of knowledge are not (
perfectly) infallible in technical philosophical jargon; their truth is not proven to be perfectly secure form all possible error via means that are themselves perfectly secure from all possible error.
More concretely, though, the way I view things is that those people that once asserted knowledge of the sun circling the Earth can, presently, be confidently stated to not have held knowledge of this. This is so because their JBT did not conform to JTB; their subjective knowledge did not conform to ontic knowledge.
When we say, “I thought I knew,” we affirm that we once held our JBT to be an instance of JTB—but that we were wrong in so thinking. (It’s telling to me that we don’t say “I believed I knew”—though we can say “I believe I know”. I’m thinking we don’t say the former because it’s redundant without rhetorical purpose and because upon discovering our mistake we acknowledge it to be due to faulty justifications then held (our beliefs of what is true, of themselves, not being at fault; for they are not knowledge in themselves). We can say the latter because, until we consciously discern we hold justifications for what we believe to be true, we do not hold a conscious awareness of the given belief being knowledge—though we can intuitively sense that it is. Hence, we can believe we know.)
To sum things up: Any validly justifiable belief of what is true (JBT) can well be an instance of a belief that is ontically true and thereby justifiable (JTB). If inconsistencies are lacking, then there’s no justification by which to assume that an instance of JBT is not an instance of JTB. Nevertheless, until we can infallibly prove ontic truths (something which fallibilists will uphold cannot be done by us), we could, hypothetically, be mistaken in our upholding any instance of JBT to be JTB. But: until evidence presents itself to the contrary, because all our JBTs could all (or at least mostly) well be instances of JTB, we then are justified in proclaiming that we hold knowledge (JTB).
I’m still working though some of the connotative facets of this myself—making a concept simple and unambiguous from multiple vantages if sometimes harder than it should be. However, I again find that this outlook does justify why the guy who “knew” that the Earth is flat didn’t in fact hold knowledge of this: we currently have ample means by which to evidence that his JBT did not conform to JTB.
So JTB stays, imo, at least in the ways just outlined.
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I'm appending this in attempts to be clearer: I understand and agree with all our held knowledge being fallible, and that we thereby (to incorporate the semantics I previously used) can only hold onto JBT that has so far not been falsified in being JTB—and which, thereby, can very well be JTB (as here interpreted: ontically true belief that is thereby justifiable).