The Republic by Plato Part 4 Page 48

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?