If it is possible that nothing can be known, then nothing can be known. Why? Because that possibility (whatever it may consist of) makes knowledge uncertain. Thus, your proposition that “possibly nothing can be known” is also self-refuting. It is not a statement of knowledge. You can’t even consistently state that “possibly nothing can be known,” because to do so makes a claim to knowledge.
Precisely. The impossibility of knowledge, if entertained only in possibility, substantiates itself in substance. In fact, I don’t even need to demonstrate that knowledge is impossible, but only that it is possible that it is impossible.
But not even this, it need only be held that it is possible that it is possible.
And, even if this is dubious, that it is possible that it is possible that it is possible.
It could go on infinitely, in a chain of infinite possibilities. Now, just as in a infinite series of coin-flips, sooner or later heads will come up, so, sooner or later all certainty will deconstruct. Or, in an infinite chain, there will be one unsound link- and that is enough to break cause the whole chain to fail.
Your further claim that even the proposition “possibly nothing can be known” could itself possibly not be known just demonstrates how badly your argument is undermined. If the proposition you advance can’t be know, then at best you are stating a mere belief. But why would your personal belief hold any relevance?
Possibly. Or possibly, as shown above, it deomonstrate how WELL my argument is constructed. Who knows? Not I, and, neither not you. Granted, you
think you know. But that is not the same as knowing.
I suppose my personal belief has as much claim to relevance as your belief that my belief has no relevance.?
Btw, how could the basic belief “I am in pain” possibly be something that can’t be known?
Perhaps the sensation of pain is an illusion or hallucination. What grounds are there for believing perception, other than perception itself (which is inadmissable as evidence, due to circularity)?
Perhaps, what constitutes pain and pleasure is merely a relative matter, depending on taste (some people find eating chilli painful, others find it pleasurable).
Perhaps it is all a dream, and you imagine you are subject X experiencing pain, when in reality your are a butterfuly dreaming that you are subject X experiencing pain.