Can you tell me whence I derive this inference?
I cannot, but I should like to be told.
Because I think that this is the only virtue which remains in the State when the other virtues of temperance and courage and wisdom are abstracted; and, that this is the ultimate cause and condition of the existence of all of them, and while remaining in them is also their preservative; and we were saying that if the three were discovered by us, justice would be the fourth or remaining one.
That follows of necessity.
If we are asked to determine which of these four qualities by its presence contributes most to the excellence of the State, whether the agreement of rulers and subjects, or the preservation in the soldiers of the opinion which the law ordains about the true nature of dangers, or wisdom and watchfulness in the rulers, or whether this other which I am mentioning, and which is found in children and women, slave and freeman, artisan, ruler, subject,--the quality, I mean, of every one doing his own work, and not being a busybody, would claim the palm--the question is not so easily answered.
Certainly, he replied, there would be a difficulty in saying which.
Then the power of each individual in the State to do his own work appears to compete with the other political virtues, wisdom, temperance, courage.
Yes, he said.
And the virtue which enters into this competition is justice?
Exactly.
Let us look at the question from another point of view: Are not the rulers in a State those to whom you would entrust the office of determining suits at law?
Certainly.
And are suits decided on any other ground but that a man may neither take what is another's, nor be deprived of what is his own?
Yes; that is their principle.
Which is a just principle?
Yes.
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.