You are just falling into the old error, Socrates, he said. You come asking in what wisdom or temperance differs from the other sciences, and then you try to discover some respect in which they are alike; but they are not, for all the other sciences are of something else, and not of themselves; wisdom alone is a science of other sciences, and of itself. And of this, as I believe, you are very well aware: and that you are only doing what you denied that you were doing just now, trying to refute me, instead of pursuing the argument.
And what if I am? How can you think that I have any other motive in refuting you but what I should have in examining into myself? which motive would be just a fear of my unconsciously fancying that I knew something of which I was ignorant. And at this moment I pursue the argument chiefly for my own sake, and perhaps in some degree also for the sake of my other friends. For is not the discovery of things as they truly are, a good common to all mankind?
Yes, certainly, Socrates, he said.
Then, I said, be cheerful, sweet sir, and give your opinion in answer to the question which I asked, never minding whether Critias or Socrates is the person refuted; attend only to the argument, and see what will come of the refutation.
I think that you are right, he replied; and I will do as you say.
Tell me, then, I said, what you mean to affirm about wisdom.
I mean to say that wisdom is the only science which is the science of itself as well as of the other sciences.
But the science of science, I said, will also be the science of the absence of science.
Very true, he said.
Then the wise or temperate man, and he only, will know himself, and be able to examine what he knows or does not know, and to see what others know and think that they know and do really know; and what they do not know, and fancy that they know, when they do not. No other person will be able to do this. And this is wisdom and temperance and self-knowledge—for a man to know what he knows, and what he does not know. That is your meaning?