Thomas Aquinas — on 2Cor 3:6 (Commentary on 2 Corinthians)

“Having commended the ministry of the New Testament, the Apostle then commends its ministers. First, he stipulates two things, which correspond to the above words. For he had mentioned a gift received from God when he said, our competence is from God, and the confidence born of this gift when he said, such is the confidence that we have through Christ toward God. First, therefore, he determines the things pertaining to the gift received; secondly, those pertaining to the confidence born of it (v. 12). In regard to the first he does three things: first, he discloses the gift received from God, namely, the ministry of the New Testament; secondly, he describes the New Testament (v. 6b); thirdly, from the dignity of the New Testament he shows the dignity of its ministers (v. 9). He says, therefore: I say that our sufficiency is from God who has made us competent to be ministers of a new covenant: "Men shall speak of you as the ministers of our God" (Is. 61:6). And in this we hold the place of angels: "Who make angels your messengers, fire and flame your ministers" (Ps. 104:4). But he not only made us ministers, but fit ones. For God gives to each being the things through which it can attain to the perfection of its nature. Hence, because God constituted ministers of the New Testament, he made them fit to exercise this office, unless he was impeded on the part of the receivers: "Who is sufficient for these things" (2 Cor. 2:16), namely, as are the Apostles instituted by God. He describes what this New Testament is when he continues, not in a written code but in the Spirit. He describes it in regard to two things, namely, as to that in which it consists and as to its cause for which it has been given: for the written code kills. In regard to the first it should be noted that the Apostle speaks profoundly, for it is stated in Jeremiah (31:31): "I will make a new covenant with the house of Israel, and with the house of Judah, not like the covenant which I made with their fathers"; and later on (v. 33): "I will put my law within them, and I will write it on their hearts; and I will be their God and they shall be my people." The Old Testament, therefore, is written in a book, later to be sprinkled with blood, as it says in Hebrews (9:19): "He took the blood of calves and goats and sprinkled both the book itself and all the people, saying: 'This is the blood of the covenant which God commanded you.'" So it is clear that the Old Law is a covenant of words, but the New Covenant is a covenant of the Holy Spirit, by whom the love of God is poured out in our hearts, as it says in Rom. 5:5. Consequently, when the Holy Spirit produces charity in us, which is the fulness of the Law, it is a New Covenant, not in a written code, i.e., not written down, but in the Spirit, i.e., through the Spirit who gives life: "The law of the Spirit of life" (Rom. 8:2), i.e., life-giving. The reason why the New Testament was given by the Spirit is indicated when he says, for the written code kills, not as a cause but as an occasion. For the written Law only gives knowledge of sin: "For through the Law comes knowledge of sin" (Rom. 3:20). But as a result of merely knowing sin, two things follow. For the Law, although sin is known by it, does not repress concupiscence, but is the occasion of increasing it, inasmuch as concupiscence is enkindled the more by something forbidden. Hence such knowledge kills, when the cause of concupiscence has not yet been destroyed. As a result it adds to the sin. For it is more grievous to sin against the written and natural law than against the natural law only: "But sin, finding opportunity in the commandment, wrought in me all kinds of concupiscence" (Rom. 7:8). But although it is the occasion of killing inasmuch as it increases concupiscence and increases the sin, the Law is not evil, because at least it forbids evil; nevertheless, it is imperfect, inasmuch as it does not remove the cause. Therefore, the Law without the Spirit inwardly impressing the Law on the heart is the occasion of death; hence, it was necessary to give the Law of the Spirit, who gives life by producing charity in the heart: "It is the Spirit that gives life" (Jn. 6:63).”