“Christ is not only preached through His own disciples, but also wrought so persuasively on men’s understanding that, laying aside their savage habits and forsaking the worship of their ancestral gods, they learnt to know Him and through Him to worship the Father. While they were yet idolaters, the Greeks and Barbarians were always at war with each other, and were even cruel to their own kith and kin. Nobody could travel by land or sea at all unless he was armed with swords, because of their irreconcilable quarrels with each other. Indeed, the whole course of their life was carried on with the weapons. But since they came over to the school of Christ, as men moved with real compunction they have laid aside their murderous cruelty and are war-minded no more. On the contrary, all is peace among them and nothing remains save desire for friendship.
Who, then, is He Who has done these things and has united in peace those who hated each other, save the beloved Son of the Father, the common Saviour of all, Jesus Christ, Who by His own love underwent all things for our salvation? Even from the beginning, moreover, this peace that He was to administer was foretold, for Scripture says, ‘They shall beat their swords into ploughshares and their spears into sickles, and nation shall not take sword against nation, neither shall they learn any more to wage war.’(Isaiah 2:4) Nor is this by any means incredible.
The barbarians of the present day are naturally savage in their habits, and as long as they sacrifice to their idols they rage furiously against each other and cannot bear to be a single hour without weapons. But when they hear the teaching of Christ, forthwith they turn from fighting to farming, and instead of arming themselves with swords extend their hands in prayer. In a word, instead of fighting each other, they take up arms against the devil and the demons, and overcome them by their self-command and integrity of soul.”
St. Athanasius the Great