7 But if the ministration of death, written and engraven in stones, was glorious, so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance; which glory was to be done away:
[AD 220] Tertullian on 2 Corinthians 3:7
He alludes to Moses' veil, covered with which "his face could not be stedfastly seen by the children of Israel." Since he did this to maintain the superiority of the glory of the New Testament, which is permanent in its glory, over that of the Old, "which was to be done away," this fact gives support to my belief which exalts the Gospel above the law and you must look well to it that it does not even more than this.

[AD 220] Tertullian on 2 Corinthians 3:7
Since he did this to maintain the superiority of the glory of the New Testament, which is permanent in its glory, over that of the Old, "which was to be done away," this fact gives support to my belief which exalts the Gospel above the law and you must look well to it that it does not even more than this.

[AD 253] Origen of Alexandria on 2 Corinthians 3:7
But as the apostle discusses these things with that noble understanding which he employs in other matters, he writes: “But we have the mind of Christ.” He also says: “But if the ministry of death written with letters upon stones was glorious, so that the sons of Israel could not steadfastly behold the face of Moses for the glory of his countenance, which is passing away, will not the ministry of the spirit be rather in glory?” And again a little later he says, “And not as Moses placed a veil on his face that the sons of Israel might not steadfastly look at the appearance of his countenance. For their senses were made dull, for up to this present day when Moses is read, the veil is upon their heart.” Who would not wonder at the magnitude of the mysteries? Who would not greatly fear the sign of a dulled heart? Moses’ face was glorified, but “the sons of Israel” were not able “to look at the appearance of his countenance”; the people of the synagogue were not able “to look.” But if anyone can be superior in conduct and life to the multitude, he can look at the glory of his countenance. For even now, as the apostle says, “The veil is placed on the reading of the Old Testament”.; even now Moses speaks with glorified countenance, but we are not able to look at the glory which is in his countenance. We are not able, therefore, because we are still the populace, and we have no zeal or merit more than the common crowd. But because the holy apostle says, “but that same veil remains in the reading of the Old Testament,” the expressed opinion of such a great apostle would have cut off all hope of understanding for us if he had not added: “But when anyone shall turn to the Lord, the veil shall be removed.” He says, therefore, that the cause of the removal of the veil is our turning to the Lord. We should draw the conclusion from this that as long as we read the divine Scriptures without understanding, as long as what has been written is obscure to us and closed, we have not yet turned to the Lord. For if we had turned to the Lord, without doubt the veil would have been removed.

[AD 253] Origen of Alexandria on 2 Corinthians 3:7
The apostle briefly indicates the reason that these words that were read to us can be understood or not understood when he says that “the veil of the Old Testament” can “be removed” from the eyes of the one “who has been converted to the Lord.” From this, he wanted it understood that these things are less clear to us to the same degree as our conversion to the Lord is less complete. And for that reason, this must be worked at with all our strength so that, free from secular occupations and mundane deeds, and if possible leaving behind these unnecessary fables of friends, we may apply ourselves to the Word of God and “meditate on his law day and night.” The result will be the conversion of the entire heart. Then we can see the face of Moses, opened and unveiled.

[AD 407] John Chrysostom on 2 Corinthians 3:7
The law served death but was not its cause. What caused death was sin, but the law brought in punishment and showed the sin up for what it was—it did not cause it. The law did not minister to the existence of sin or death but to the suffering of retribution by the sinner, so that in this way it was even more destructive of sin.

[AD 407] John Chrysostom on 2 Corinthians 3:7-8
But if the ministration of death, written and engraven in stones, came with glory, so that the children of Israel could not look steadfastly upon the face of Moses, for the glory of his face; which glory was passing away: how shall not rather the ministration of the Spirit be with glory?

He said that the tables of Moses were of stone, as [also] they were written with letters; and that these were of flesh, I mean the hearts of the Apostles, and had been written on by the Spirit; and that the letter indeed kills, but the Spirit gives life. There was yet wanting to this comparison the addition of a further and not trifling particular, that of the glory of Moses; such as in the case of the New Covenant none saw with the eyes of the body. And even for this cause it appeared a great thing in that the glory was perceived by the senses; (for it was seen by the bodily eyes, even though it might not be approached;) but that of the New Covenant is perceived by the understanding. For to the weaker sort the apprehension of such a superiority is not clear; but the other did more take them, and turn them unto itself. Having then fallen upon this comparison and being set upon showing the superiority [in question], which yet was exceedingly difficult because of the dulness of the hearers; see what he does, and with what method he proceeds in it, first by arguments placing the difference before them, and constructing these out of what he had said before.

For if that ministration were of death, but this of life, doubtless, says he, the latter glory is also greater than the former. For since he could not exhibit it to the bodily eyes, by this logical inference he established its superiority, saying,

[AD 428] Theodore of Mopsuestia on 2 Corinthians 3:7
Paul did not say the dispensation of the law but the dispensation of death, speaking rather of its result in order to lessen its attraction.