Nor thirdly, supposing any man had obtained an apprehension of what is real,
could he possibly communicate it to any one else. If a man saw anything, he
could not possibly by verbal description make clear what it is he sees to a
man who has never seen. And so if a man has not himself the apprehension of
reality, mere words from another cannot possibly give him any idea of it. He
may imagine he has the same idea as the speaker, but where is he going to
get the common test by which to establish the identity?
Without attempting to follow Gorgias further, we can see plainly enough the
object and purport of the whole doctrine. Its main result is to isolate.
It isolates each man from his fellows; he cannot tell what they know or
think, they cannot reach any common ground with him. It isolates him from
nature; he cannot tell what nature is, he cannot tell whether he knows
anything of nature or reality at all. It isolates him from himself; he
cannot tell for certain what relation exists (if any) between what he
imagines he perceives at any moment and any remembered or imagined previous
experiences; he cannot be sure that there ever were any such experiences, or
what that self was (if anything) which had them, or whether there was or is
any self perceiving anything.