But he says it in a rather riddling fashion, as a prophet would; for Know thyself! and Be temperate! are the same, as the inscription Throughout this passage there is allusion to the thought or wisdom implied in σωφρονεῖν, and here Critias seeks to identify φρόνει (think well, be wise) with γνῶθι (know, understand) in the inscription γνῶθι σαυτόν at Delphi. and I declare, though one is likely enough to think them different—an error into which I consider the dedicators of the later inscriptions fell when they put up Nothing overmuch μηδὲν ἄγανappears first in Theognis, 335. and A pledge, and thereupon perdition. Ἐγγύα πάρα δ’ ἄτη, an old saying on the rashness of giving a pledge, is quoted in a fragment of Cratinus, the elder rival of Aristophanes. Cf. Proverbs xi. 15—He that is surety for a stranger shall smart for it. For they supposed that Know thyself! was a piece of advice, and not the god’s salutation of those who were entering; and so, in order that their dedications too might equally give pieces of useful advice, they wrote these words and dedicated them. Now my object in saying all this, Socrates, is to abandon to you all the previous argument— for, though perhaps it was you who were more in the right, or perhaps it was I, yet nothing at all certain emerged from our statements—and to proceed instead to satisfy you of this truth, if you do not admit it, that temperance is knowing oneself. Why, Critias, I said, you treat me as though I professed to know the things on which I ask questions, and needed only the will to agree with you. But the fact of the matter is rather that I join you in the inquiry, each time that a proposition is made, because I myself do not know; I wish therefore to consider first, before I tell you whether I agree or not. Now, give me a moment to consider. Consider then, he said. Yes, and I am considering, I said. For if temperance is knowing anything, obviously it must be a kind of science, and a science of something, must it not? It is, he replied, and of itself. And medicine, I said, is a science of health? Certainly. Then if you should ask me, I said, wherein medicine, as a science of health, is useful to us, and what it produces, I should say it is of very great benefit, since it produces health; an excellent result, if you allow so much. I allow it.And so, if you should ask me what result I take to be produced by building, as the builder’s science, I should say houses; and it would be the same with the other arts. Now it is for you, in your turn, to find an answer to a question regarding temperance—since you say it is a science of self, Critias—and to tell me what excellent result it produces for us, as science of self, and what it does that is worthy of its name. Come now, tell me. But, Socrates, he said, you are not inquiring rightly. For in its nature it is not like the other sciences, any more than any of them is like any other; whereas you are making your inquiry as though they were alike.

For tell me, he said, what result is there of the arts of reckoning and geometry, in the way that a house is of building, or a coat of weaving, or other products of the sort that one might point to in various arts? Well, can you, for your part, point to any such product in those two cases? You cannot. To this I replied: What you say is true; but I can point out to you what is the peculiar subject of each of these sciences, distinct in each case from the science itself. Thus reckoning, I suppose, is concerned with the even and the odd in their numerical relations to themselves and to one another, is it not?Certainly, he said. And you grant that the odd and the even are different from the actual art of reckoning? Of course. And once more, weighing is concerned with the heavier and the lighter weight; but the heavy and the light are different from the actual art of weighing: you agree? I do. Then tell me, what is that of which temperance is the science, differing from temperance itself? There you are, Socrates, he said: you push your investigation up to the real question at issue—in what temperance differs from all the other sciences—but you then proceed to seek some resemblance between it and them; whereas there is no such thing, for while all the rest of the sciences have something other than themselves as their subject, this one alone is a science of the other sciences and of its own self. And of this you are far from being unconscious, since in fact, as I believe, you are doing the very thing you denied you were doing just now: for you are attempting to refute me, without troubling to follow the subject of our discussion. How can you think, I said, if my main effort is to refute you, that I do it with any other motive than that which would impel me to investigate the meaning of my own words—from a fear of carelessly supposing, at any moment, that I knew something while I knew it not? And so it is now: that is what I am doing, I tell you. I am examining the argument mainly for my own sake, but also, perhaps, for that of my other intimates. Or do you not think it is for the common good, almost, of all men, that the truth about everything there is should be discovered? Yes indeed, he replied, I do, Socrates. Then take heart, I said, my admirable friend, and answer the question put to you as you deem the case to be, without caring a jot whether it is Critias or Socrates who is being refuted: give the argument itself your attention, and observe what will become of it under the test of refutation. Well, he said, I will do so; for I think there is a good deal in what you say. Then tell me, I said, what you mean in regard to temperance. Why, I mean, he said, that it alone of all the sciences is the science both of itself and of the other sciences.So then, I said, it will be the science of the lack of science also, besides being the science of science? Science or exact knowledge must be able to measure not only the field of knowledge, but also that of its negation, ignorance. Certainly, he replied.

And have you ever observed any fear which fears itself and the other fears, but has no fear of a single dreadful thing? No, I have not, he replied. Or an opinion which is an opinion of opinions and of itself, but without any opinion such as the other opinions have? By no means. But it is apparently a science of this kind that we are assuming—one that is a science of no branch of study, but a science of itself and of the other sciences. So we are. And it is a strange thing, if it really exists? For we should not affirm as yet that it does not exist, but should still consider whether it does exist. You are right. Well now, this science is a science of something, that is, it has a certain faculty whereby it can be a science of something, has it not? Certainly. For, you know, we say the greater has a certain faculty whereby it can be greater than something? At this point Socrates adduces the relation of greater to smaller (τινὸς εἶναι μεῖζον) to suggest a difficulty in conceiving a science to be a science of itself: in so doing he draws a false analogy between two quite different uses of the genitive in Greek, represented in English by the comparative than and the objective of. Quite so. That is, than something smaller, if it is to be greater. Necessarily. So if we could find a greater which is greater than other greater things, and than itself, but not greater than the things beside which the others are greater, I take it there can be no doubt that it would be in the situation of being, if greater than itself, at the same time smaller than itself, would it not? Most inevitably, Socrates, he said. Or again, if there is a double of other doubles and of itself, both it and the others must of course be halves, if it is to be their double; for, you know, a double cannot be of anything else than its half. True. And what is more than itself will also be less, and the heavier will be lighter, and the older younger, and so on with everything else: whatever has its own faculty applied to itself will have also the natural quality to which its faculty was applicable, will it not? For instance, hearing is, as we say, just a hearing of sound, is it not?Yes. So if it is to hear itself, it will hear a sound of its own; for it would not hear otherwise. Most inevitably. And sight, I suppose, my excellent friend, if it is to see itself, must needs have a color; for sight can never see what is colorless. No more it can. Then do you perceive, Critias, in the various cases we have propounded, how some of them strike us as absolutely impossible, while others raise serious doubts as to the faculty of the thing being ever applicable to itself? For with magnitudes, numbers, and the like it is absolutely impossible, is it not? Certainly.