The Republic by Plato Part 5 Page 77

Just so.

And as they are Hellenes themselves they will not devastate Hellas, nor will they burn houses, nor ever suppose that the whole population of a city — men, women, and children — are equally their enemies, for they know that the guilt of war is always confined to a few persons and that the many are their friends.

And for all these reasons they will be unwilling to waste their lands and rase their houses; their enmity to them will only last until the many innocent sufferers have compelled the guilty few to give satisfaction?

I agree, he said, that our citizens should thus deal with their Hellenic enemies; and with barbarians as the Hellenes now deal with one another.

Then let us enact this law also for our guardians: —