It is impossible.

Then he who is ignorant of these things will only know that he knows, but
not what he knows?

True.

Then wisdom or being wise appears to be not the knowledge of the things
which we do or do not know, but only the knowledge that we know or do not
know?

That is the inference.

Then he who has this knowledge will not be able to examine whether a
pretender knows or does not know that which he says that he knows: he will
only know that he has a knowledge of some kind; but wisdom will not show
him of what the knowledge is?

Plainly not.

Neither will he be able to distinguish the pretender in medicine from the
true physician, nor between any other true and false professor of
knowledge. Let us consider the matter in this way: If the wise man or any
other man wants to distinguish the true physician from the false, how will
he proceed? He will not talk to him about medicine; and that, as we were
saying, is the only thing which the physician understands.

True.