which is the science of building, I should say houses, and so of other
arts, which all have their different results. Now I want you, Critias, to
answer a similar question about temperance, or wisdom, which, according to
you, is the science of itself. Admitting this view, I ask of you, what
good work, worthy of the name wise, does temperance or wisdom, which is the
science of itself, effect? Answer me.

That is not the true way of pursuing the enquiry, Socrates, he said; for
wisdom is not like the other sciences, any more than they are like one
another: but you proceed as if they were alike. For tell me, he said,
what result is there of computation or geometry, in the same sense as a
house is the result of building, or a garment of weaving, or any other work
of any other art? Can you show me any such result of them? You cannot.

That is true, I said; but still each of these sciences has a subject which
is different from the science. I can show you that the art of computation
has to do with odd and even numbers in their numerical relations to
themselves and to each other. Is not that true?

Yes, he said.

And the odd and even numbers are not the same with the art of computation?

They are not.

The art of weighing, again, has to do with lighter and heavier; but the art
of weighing is one thing, and the heavy and the light another. Do you
admit that?

Yes.