John Chrysostom

But he was not content with this consideration only in order to establish the superiority [in question]; but he addeth yet another, saying, "written, and engraven on stones." See how he again cuts at the root of the Jewish arrogancy. For the Law was nothing else but letters: a certain succor was not found leaping forth from out the letters and inspiring them that combat, as is the case in Baptism; but pillars and writings bearing death to those who transgress the letters. …

Homily 7 on 2 Corinthians ↗

Theophylact of Ohrid

Having shown above the difference between the New and Old Testaments, which consists in the fact that the latter is written with ink, while the former with the Spirit, the one on stones, and the other on hearts, and also that the latter kills, while the former gives life, he now wishes to show that the glory of the Gospel is also greater. …

Commentary on 2 Corinthians ↗

Thomas Aquinas

From these, therefore, he shows the dignity of his ministry. He does two things in this regard. First, he shows that the ministry of the New Testament is preferred to the Old; secondly, that it is not only preferred, but that in comparison to the Old Testament, the latter has, as it were, nothing of glory (v. 10). In regard to the first, he does two things. First, he shows that the ministry of the New Testament is preferred to the Old; secondly, he assigns the reason for this (v. 9). …

Commentary on 2 Corinthians ↗