The qualification having been mentioned, the Apostle proceeds, as usual, to enlarge upon it. "Our sufficiency is of God; who also made us sufficient as ministers of a new covenant; not of letter, but of spirit: for the letter killeth, but the spirit giveth life." At the first glance, we see no reason why his thought should take this direction, and it can only be because those whom he is opposing, and with whom he has contrasted himself in chap. ii. 17, are in some sense representatives of the old covenant, ministers of the letter in spite of their claim to be evangelists, and appealing not to a competency which came from God, but to one which rested on "the flesh." They based their title to preach on certain advantages of birth, or on having known Jesus when He lived in the world, or perhaps on certification by others who had known Him; at all events, not on that spiritual competence which Paul's ministry at Corinth had shown him to possess. That this was really the case will be seen more fully at a later stage (especially in chaps. x. ff.).
With the words "ministers of a new covenant" we enter upon one of the great passages in St. Paul's writings, and are allowed to see one of the inspiring and governing ideas in his mind. "Covenant," even to people familiar with the Bible, is beginning to be a remote and technical term; it needs to be translated or explained. If no more than another word is to be used, perhaps "dispensation" or "constitution" would suggest something. God's covenant with Israel was the whole constitution under which God was the God of Israel, and Israel the people of God. The new covenant of which Paul speaks necessarily implies an old one; and the old one is this covenant with Israel. It was a national covenant, and for that, among other reasons, it was represented and embodied in legal forms. There was a legal constitution under which the nation lived, and according to which all God's dealings with it, and all its dealings with God, were regulated. Without entering more deeply, in the meantime, into the nature of this constitution, or the religious experiences which were possible to those who lived under it, it is sufficient to notice that the best spirits in the nation became conscious of its inadequacy, and eventually of its failure. Jeremiah, who lived through the long agony of his country's dissolution, and saw the final collapse of the ancient order, felt this failure most deeply, and was consoled by the vision of a brighter future. That future rested for him on a more intimate relation of God to His people, on a constitution, as we may fairly paraphrase his words, less legal and more spiritual. "Behold, the days come, saith the Lord, that I will make a new covenant with the house of Israel, and with the house of Judah: not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which My covenant they brake, although I was an husband unto them, saith the Lord. But this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my law in their inward parts, and in their heart will I write it; and I will be their God, and they shall be My people: and they shall teach no more every man his neighbour, and every man his brother, saying, Know the Lord: for they shall all know Me, from the least of them unto the greatest of them, saith the Lord: for I will forgive their iniquity, and their sin will I remember no more." This wonderful passage, so profound, so spiritual, so evangelical, is the utmost reach of prophecy; it is a sort of stepping-stone between the Old Testament and the New. Jeremiah has cried to God out of the depths, and God has heard his cry, and raised him to a spiritual height from which his eye ranges over the land of promise, and rests with yearning on all its grandest features. We do not know whether many of his contemporaries or successors were able to climb the mount which offered this glorious prospect; but we know that the promise remained a promise--a rainbow light across the dark cloud of national disaster--till Christ claimed its fulfilment as His work. It was His to make good all that the prophets had spoken; and when in the last hours of His life He said to His disciples, "This is My blood of the covenant,[24] which is shed for many, for the remission of sins," it was exactly as if He had laid His hand on that passage of Jeremiah, and said, "This day is this scripture fulfilled before your eyes." By the death of Jesus a new spiritual order was established; it rested on the forgiveness of sins, it made God accessible to all, it made obedience an instinct and a joy; all the intercourse of God and man was carried on upon a new footing, under a new constitution; to use the words of the prophet and the apostle, God made a new covenant with His people.