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Aug 26 '19 at 18:15 comment added SmootQ And if the truth is only partly detected through justification, then all of our knowledge is based on belief and justification, from which we assume that such and such justification must match or point to such and such truth. But we do not have any way to access truth (independent of justification). For example, we claim to know that there is a sun, (we believe it, good. Our belief is justified , also good. But is it true?) .. Well, this last part only comes from our "justification". There is no way to access this information without justification... We only assume it, we don't know it.
Aug 26 '19 at 18:11 comment added SmootQ On a deeper level, we assume pretty much everything we "claim" to know, and we base this only on justification and belief (but not truth, since there is no immediate access to the truth of things except through the senses and experience)... That's why I am a skeptic (I think that real knowledge is impossible), because most of our knowledge is based on assumptions.
Aug 26 '19 at 17:24 comment added Logikal Either you know x is true or you assume x is true and not both? Well the semantically many Mathematical people use hypothetical statements to prevent being proven wrong. Your use of the hypothetical in the unicorn example shows this. But all hypothetical statements have the same form but the content of what the propositions express are not identical. The form is identical though. So how do we tell the real truth from the hypothetical truths from he form If . . . THEN FORM?
Aug 25 '19 at 16:32 comment added Philip Klöcking @TKN You presuppose that there is something like absolute truth or provable truth. It can be and has been shown that there is no consistent meaningful way of speaking about an absolute truth. Truth is context sensitive and it has to be that way if it is to be expressed by language. So the question "But what if we are brains-in-vats" not only can be answered by "Would it make any meaningful difference for us?", it also is literal nonsense to even ask that question if there is no way to validate an answer.
Aug 25 '19 at 7:00 comment added TKN Yes, I understand your point but we cannot prove that what is justified is the truth. We cannot prove anything in the real world and therefore we can only believe that a statement we are proposing is true. We could be living in a virtual reality and the truth therefore would looked very different from what we see. In other words, we cannot know the absolute truth and therefore everything we label as the truth is just our assumption based on belief that our sensory data correlate with the reality (it could be some brain in the vat reality for example).
Aug 24 '19 at 21:48 history answered SmootQ CC BY-SA 4.0