John Chrysostom
He does not say this simply, but after first saying, "having put on" and "having girded." This is precisely the sign of constant and uninterrupted readiness for departure to battle. Hear what the prophet says: "Let it be to him like a garment with which he clothes himself, and like a belt with which he always girds himself" (Ps 108:19). The prophet says that God Himself put on the breastplate of righteousness. By this he shows that we must clothe ourselves in it not for a short time, but forever, since our need for war is constant. Another says elsewhere: "The righteous is bold as a lion" (Prov 28:1). Whoever is clothed in such a breastplate has nothing to fear from enemy armies. On the contrary, he can boldly enter into the very midst of the enemies.
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And Isaiah says: "How beautiful are the feet of the one who proclaims good tidings" (Is 52:7). Who after this will not resolve, who will not hasten to serve such a work as the Gospel of peace? And this is God's peace with men, a peace given to us without any labor on man's part, but by the mercy of God Who accomplished it.