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ION: That is good, Socrates; and yet I doubt whether you will ever have eloquence enough to persuade me that I praise Homer only when I am mad and possessed; and if you could hear me speak of him I am sure you would never think this to be the case.

SOCRATES: I should like very much to hear you, but not until you have answered a question which I have to ask. On what part of Homer do you speak well?–not surely about every part.

ION: There is no part, Socrates, about which I do not speak well: of that I can assure you.

SOCRATES: Surely not about things in Homer of which you 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 doings of that art?

ION: Very true.

SOCRATES: Then which will be a better judge of the lines which you were reciting from Homer, you or the charioteer?

ION: The charioteer.

SOCRATES: Why, yes, because you are a rhapsode and not a charioteer.

ION: Yes.

SOCRATES: And the art of the rhapsode is different from that of the charioteer?

ION: Yes.

SOCRATES: And if a different knowledge, then a knowledge of different matters?

ION: True.

SOCRATES: You know the passage in which Hecamede, the concubine of Nestor, is described as giving to the wounded Machaon a posset, as he says,

‘Made with Pramnian wine; and she grated cheese of goat’s milk with a grater of bronze, and at his side placed an onion which gives a relish to drink (Il.).’