John Chrysostom
Finally, having sufficiently defended himself in every respect and assured them that he said nothing out of anger or ill will, but bears unchanged love toward them, he confirms the same again. He concludes his word with a prayer filled with countless good things, saying: "The grace of our Lord Jesus Christ be with your spirit, brethren. Amen." By these final words he set a seal on everything said before. Indeed, he did not simply say, "with you," as he says in other epistles, but "with your spirit." He turns them away from the fleshly, everywhere points to God's benefits, and reminds them of the grace they received, which was sufficient to deliver them from every Judaic error.
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As the reception of the Spirit depended not on the weak law but on justification through faith, so retaining Him after reception depended not on circumcision but on grace. Therefore he concluded the exhortation with prayer, reminded them of grace and the spirit, and called them brothers. Having invoked God that they might constantly enjoy these gifts, he fenced them with a double fence, because what he said is both prayer and complete instruction. Therefore it serves them as a double wall. The instruction, reminding them of what blessings they had been counted worthy, could very powerfully hold them in the doctrines of the Church. The prayer, invoking grace and entreating it to remain in them without departure, did not allow the Spirit to depart from them. When the Spirit remains in them, every false teaching will disappear like dust, in Christ Jesus our Lord, to whom be glory and dominion with the Father and the Holy Spirit, now and ever and unto the ages of ages. Amen.