Then on this view also justice will be admitted to be the having and
doing what is a man's own, and belongs to him?

Very true.

Think, now, and say whether you agree with me or not. Suppose a
carpenter to be doing the business of a cobbler, or a cobbler of a
carpenter; and suppose them to exchange their implements or their
duties, or the same person to be doing the work of both, or whatever be
the change; do you think that any great harm would result to the State?

Not much.

But when the cobbler or any other man whom nature designed to be a
trader, having his heart lifted up by wealth or strength or the number
of his followers, or any like advantage, attempts to force his way
into the class of warriors, or a warrior into that of legislators and
guardians, for which he is unfitted, and either to take the implements
or the duties of the other; or when one man is trader, legislator, and
warrior all in one, then I think you will agree with me in saying that
this interchange and this meddling of one with another is the ruin of
the State.

Most true.

Seeing then, I said, that there are three distinct classes, any meddling
of one with another, or the change of one into another, is the greatest
harm to the State, and may be most justly termed evil-doing?

Precisely.

And the greatest degree of evil-doing to one's own city would be termed
by you injustice?

Certainly.

This then is injustice; and on the other hand when the trader, the
auxiliary, and the guardian each do their own business, that is justice,
and will make the city just.

I agree with you.

We will not, I said, be over-positive as yet; but if, on trial, this
conception of justice be verified in the individual as well as in
the State, there will be no longer any room for doubt; if it be not
verified, we must have a fresh enquiry. First let us complete the old
investigation, which we began, as you remember, under the impression
that, if we could previously examine justice on the larger scale, there
would be less difficulty in discerning her in the individual. That
larger example appeared to be the State, and accordingly we constructed
as good a one as we could, knowing well that in the good State justice
would be found. Let the discovery which we made be now applied to the
individual--if they agree, we shall be satisfied; or, if there be a
difference in the individual, we will come back to the State and
have another trial of the theory. The fri