M. Tullius Cicero, De Officiis
Walter Miller, Ed.

[35] The only. ¹ excuse, therefore, for going to war is that we may live in peace unharmed; and when the victory is won, we should spare those who have not been blood-thirsty and barbarous in their warfare. For² instance, our forefathers actually admitted to full rights of citizenship the Tusculans, Aequians, Volscians, Sabines, and Hernicians, but they razed Carthage and Numantia to the ground. I wish they had not destroyed Corinth; but I believe they had some special reason for what they did—its convenient situation, probably—and feared that its very location might some day furnish a temptation to renew the war. In my opinion, at least, we should always strive to secure a peace that shall not admit of guile. And if my advice had been heeded on this point, we should still have at least some sort of constitutional government, if not the best in the world, whereas, as it is, we have none at all.

Not only must we show consideration for those whom we have conquered by force of arms but we must also ensure protection to those who lay down their arms and throw themselves upon the mercy of our generals, even though the battering-ram has hammered at their walls. And among our countrymen justice has been observed so conscientiously in [p. 39] this direction, that those who have given promise of protection to states or nations subdued in war become, after the custom of our forefathers, the patrons of those states.