Okay, such as specifically...The answer to your present question will depend upon which epistemological (and even Hermeneutical) frame of reference we each think we're working in, respectively. Consider it a kind of linguistic and epistemic catch-22.
But, for the time being, maybe let's just go with some of the axiomatic intuitions about it all as put forth by a few philosophers since the time of Rene Descartes, like @Silmarien, or especially Hillary Putnam as a more specific instance ...
Upvote
0