u have no
knowledge?

ION: And what is there in Homer of which I have no knowledge?

SOCRATES: Why, does not Homer speak in many passages about arts? For
example, about driving; if I can only remember the lines I will repeat
them.

ION: I remember, and will repeat them.

SOCRATES: Tell me then, what Nestor says to Antilochus, his son,
where he bids him be careful of the turn at the horserace in honour of
Patroclus.

ION: 'Bend gently,' he says, 'in the polished chariot to the left of
them, and urge the horse on the right hand with whip and voice; and
slacken the rein. And when you are at the goal, let the left horse draw
near, yet so that the nave of the well-wrought wheel may not even seem
to touch the extremity; and avoid catching the stone (Il.).'

SOCRATES: Enough. Now, Ion, will the charioteer or the physician be the
better judge of the propriety of these lines?

ION: The charioteer, clearly.

SOCRATES: And will the reason be that this is his art, or will there be
any other reason?

ION: No, that will be the reason.

SOCRATES: And every art is appointed by God to have knowledge of a
certain work; for that which we know by the art of the pilot we do not
know by the art of medicine?

ION: Certainly not.

SOCRATES: Nor do we know by the art of the carpenter that which we know
by the art of medicine?

ION: Certainly not.

SOCRATES: And this is true of all the arts;--that which we know with one
art we do not know with the other? But let me ask a prior question: You
admit that there are differences of arts?

ION: Yes.

SOCRATES: You would argue, as I should, that when one art is of one kind
of knowledge and another of another, they are different?

ION: Yes.

SOCRATES: Yes, surely; for if the subject of knowledge were the same,
there would be no meaning in saying that the arts were different,--if
they both gave the same knowledge. For example, I know that here are
five fingers, and you know the same. And if I were to ask whether I
and you became acquainted with this fact by the help of the same art of
arithmetic, you would acknowledge that we did?

ION: Yes.

SOCRATES: Tell me, then, what I was intending to ask you,--whether this
holds universally? Must the same art have the same subject of knowledge,
and different arts other subjects of knowledge?

ION: That is my opinion, Socrates.

SOCRATES: Then he who has no knowledge of a particular art will have no
right judgment of the sayings and d