John Chrysostom
Then, raising them to a higher understanding, he calls them Christ's epistle, saying: "You show by yourselves that you are a letter of Christ" (2 Cor 3:3).
Having said this, he draws from it an occasion to speak about the law. He again calls them his epistle, but in another sense.
Above he called them an epistle because they serve as his approval. Here he calls them Christ's epistle, as those who have the law of God written within them.
"What God was pleased to reveal to all and to you," he says, "all this is written in your hearts. We prepared you to receive these letters.
As Moses worked the stones and tablets, so we prepared your souls." Therefore he says: "through our ministry."
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But some will say that both tablets are equal, because the former were written by God and these by the Spirit of God. Where, then, is the difference between them?
"Written," he says, "not with ink but with the Spirit of the living God, not on tablets of stone but on fleshly tablets of the heart."
As great as the difference is between the Spirit and ink, and between stone and fleshly tablets, so great is the difference between the two writings.
By the same difference those who served the New Testament writings are distinguished from the one who served the Old Testament writings.
But lest they think that he has said too much about himself, he immediately explains himself, saying: "Such confidence we have toward God through Christ."
Thus again he ascribes everything to God and names Christ as the cause of all.