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True.

Then how will this knowledge or science teach him to know what he knows? Say that he knows health;—not wisdom or temperance, but the art of medicine has taught it to him;—and he has learned harmony from the art of music, and building from the art of building,—neither, from wisdom or temperance: and the same of other things.

That is evident.

How will wisdom, regarded only as a knowledge of knowledge or science of science, ever teach him that he knows health, or that he knows building?

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?