Then medicine does not consider the interest of medicine, but the
interest of the body?
True, he said.
Nor does the art of horsemanship consider the interests of the art of
horsemanship, but the interests of the horse; neither do any other arts
care for themselves, for they have no needs; they care only for that
which is the subject of their art?
True, he said.
But surely, Thrasymachus, the arts are the superiors and rulers of
their own subjects?
To this he assented with a good deal of reluctance.
Then, I said, no science or art considers or enjoins the interest of
the stronger or superior, but only the interest of the subject and
weaker?
He made an attempt to contest this proposition also, but finally
acquiesced.
Then, I continued, no physician, in so far as he is a physician,
considers his own good in what he prescribes, but the good of his
patient; for the true physician is also a ruler having the human body
as a subject, and is not a mere money-maker; that has been admitted?
Yes.
And the pilot likewise, in the strict sense of the term, is a ruler of
sailors and not a mere sailor?
That has been admitted.
And such a pilot and ruler will provide and prescribe for the interest
of the sailor who is under him, and not for his own or the ruler's
interest?
He gave a reluctant 'Yes.'
Then, I said, Thrasymachus, there is no one in any rule who, in so far
as he is a ruler, considers or enjoins what is for his own interest,
but always what is for the interest of his subject or suitable to his
art; to that he looks, and that alone he considers in everything which
he says and does.
When we had got to this point in the argument, and every one saw that
the definition of justice had been completely upset, Thrasymachus,
instead of replying to me, said: Tell me, Socrates, have you got a
nurse?
Why do you ask such a question, I said, when you ought rather to be
answering?
Because she leaves you to snivel, and never wipes your nose: she has
not even taught you to know the shepherd from the sheep.
What makes you say that? I replied.