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