You argue like an informer, Socrates. Do you mean, for example, that he who is mistaken about the sick is a physician in that he is mistaken? or that he who errs in arithmetic or grammar is an arithmetician or grammarian at the time when he is making the mistake, in respect of the mistake? True, we say that the physician or arithmetician or grammarian has made a mistake, but this is only a way of speaking; for the fact is that neither the grammarian nor any other person of skill ever makes a mistake in so far as he is what his name implies; they none of them err unless their skill fails them, and then they cease to be skilled artists. No artist or sage or ruler errs at the time when he is what his name implies; though he is commonly said to err, and I adopted the common mode of speaking. But to be perfectly accurate, since you are such a lover of accuracy, we should say that the ruler, in so far as he is a ruler, is unerring, and, being unerring, always commands that which is for his o

Indeed, Thrasymachus, and do I really appear to you to argue like an informer? Certainly, he replied. IDPH

IDPH And do you suppose that I ask these questions with any design of injuring you in the argument? Nay, he replied, suppose is not the wordI know it; but you will be found out, and by sheer force of argument you will never prevail. I shall not make the attempt, my dear man; but to avoid any misunderstanding occurring between us in future, let me ask, in what sense do you speak of a ruler or stronger whose interest, as you were saying, he being the superior, it is just that the inferior should executeis he a ruler in the popular or in the strict sense of the term? In the strictest of all senses, he said. And now cheat and play the informer if you can; I ask no quarter at your hands. But you never will be able, never. And do you imagine, I said, that I am such a madman as to try and cheat, Thrasymachus? I might as well shave a lion. Why, he said, you made the attempt a minute ago, and you failed.

Enough, I said, of these civilities. It will be better that I should ask you a question: Is the physician, taken in that strict sense of which you are speaking, a healer of the sick or a maker of money? And remember that I am now speaking of the true physician. A healer of the sick, he replied. And the pilotthat is to say, the true pilotis he a captain of sailors or a mere sailor? A captain of sailors. The circumstance that he sails in the ship is not to be taken into account; neither is he to be called a sailor; the name pilot by which he is distinguished has nothing to do with sailing, but is signicant of his skill and of his authority over the sailors. Very true, he said. Now, I said, every art has an interest? Certainly. For which the art has to consider and provide? Yes, that is the aim of art. And the interest of any art is the perfection of itthis and nothing else? What do you mean?