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That is because you are a quibbler, Socrates. Would you say a man deserves to be called a physician at the moment when he makes a mistake in treating his patient and just in respect of that mistake; or a mathematician when he does a sum wrong and just in so far as he gets a wrong result? Of course we do commonly speak of a physician or a mathematician or a scholar having made a mistake; but really none of these, I should say, is ever mistaken when his knowledge fails him; and at that moment he is no craftsman. And what is true of craftsmanship or any sort of skill is true of the ruler: he is never mistaken so long as he is acting as a ruler; though anyone might speak of a ruler making a mistake, just as he might of a physician.

You must understand that I was talking in that loose way when I answered your question just now; but the precise statement is this. The ruler, in so far as he is acting as a ruler, makes no mistakes and consequently enjoins what is best for himself; and that is what the subject is to do. So, as I said at first, 'right' means doing what is to the interest of the stronger.