John Chrysostom
“The God of peace will crush Satan under your feet soon.” Since the Apostle had spoken of those who introduce divisions and scandals, he now speaks of the God of peace.
He does this so that they may boldly hope for deliverance from them. One who loves peace overthrows everything that disturbs peace.
The Apostle did not say “will subject,” but what is much greater, “will crush.” He will crush not only those who introduce divisions, but also their leader, Satan.
He will not simply crush, but will crush him “under your feet.” Thus they will gain the victory and become renowned because of this victory.
The Apostle also comforts them by the shortness of time, namely by adding, “soon.” Thus his words contained both prayer and prophecy.
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“The grace of our Lord Jesus Christ be with you.” Behold the greatest weapon, the unbreakable wall, the unshaken fortress.
The Apostle reminded them of grace in order to make them more zealous.
If you were delivered from the more dangerous thing, and delivered by grace alone, much more will you be delivered from the lesser. This is especially so now that you have become friends and have added your own efforts.
Do you see how the Apostle separates neither prayer from works, nor works from prayer?
After testifying to their obedience, he then began to pray. By this he shows that, if we seek salvation with all diligence, both are necessary for us.
We need both our own efforts and the grace of God. We had need of God’s grace not only before, but also now, however great and skilled we may be.