I suppose not. Then, I said, he may sometimes do good or harm, and not know what he is himself doing, and yet, in doing good, as you say, he has done temperately or wisely. Was not that your statement? Yes. Then, as would seem, in doing good, he may act wisely or temperately, and be wise or temperate, but not know his own wisdom or temperance? But that, Socrates, he said, is impossible; and therefore if this is, as you imply, the necessary consequence of any of my previous admissions, I will withdraw them, rather than admit that a man can be temperate or wise who does not know himself; and I am not ashamed to confess that I was in error. For self-knowledge would certainly be maintained by me to be the very essence of knowledge, and in this I agree with him who dedicated the inscription, 'Know thyself!' at Delphi. That word, if I am not mistaken, is put there as a sort of salutation which the god addresses to those who enter the temple; as much as to say that the ordinary salutation of 'Hail!' is not right, and that the exhortation 'Be temperate!' would be a far better way of saluting one another. The notion of him who dedicated the inscription was, as I believe, that the god speaks to those who enter his temple, not as men speak; but, when a worshipper enters, the first word which he hears is 'Be temperate!' This, however, like a prophet he expresses in a sort of riddle, for 'Know thyself!' and 'Be temperate!' are the same, as I maintain, and as the letters imply (Greek), and yet they may be easily misunderstood; and succeeding sages who added 'Never too much,' or, 'Give a pledge, and evil is nigh at hand,' would appear to have so misunderstood them; for they imagined that 'Know thyself!' was a piece of advice which the god gave, and not his salutation of the worshippers at their first coming in; and they dedicated their own inscription under the idea that they too would give equally useful pieces of advice. Shall I tell you, Socrates, why I say all this? My object is to leave the previous discussion (in which I know not whether you or I are more right, but, at any rate, no clear result was attained), and to raise a new one in which I will attempt to prove, if you deny, that temperance is self-knowledge. Yes, I said, Critias; but you come to me as though I professed to know about the questions which I ask, and as though I could, if I only would, agree with you. Whereas the fact is that I enquire with you into the truth of that which is advanced from time to time, just because I do not know; and when I have enquired, I will say whether I agree with you or not. Please then to allow me time to reflect. Reflect, he said. I am reflecting, I replied, and discover that temperance, or wisdom, if implying a knowledge of anything, must be a science, and a science of something. Yes, he said; the science of itself. Is not medicine, I said, the science of health? True.