The Great Commentary of Cornelius a Lapide: the Epistle to the Galatians
Similarly, but much more perfectly, has the New Law, the law of Christ, been ordered. (1.) It was assigned its proper rank, as being the crown and perfection of all laws. (2.) It came in its proper time, viz., in the last age of the world, when Christ, the great Legislator, came. It was promulgated at Pentecost, on the fiftieth day after the Passover, which was a feast symbolical of pardon, freedom, bliss, and the eternal jubilee. (3.) Its place was befitting its dignity. Not on Sinai was it given but on Sion, the type and mirror of celestial glory, to which this law leads us. (4.) As to the mode of promulgation , notice that it was given with a mighty wind and fiery tongues, with the power and might of the Holy Spirit, to preach the Gospel and convert all nations, because it was a law of burning love and enkindled charity. (5.) Its contents were duly related to one another , through its precepts of faith, hope, charity, and those relating to justification and the Sacraments.
It was ordained by angels . From this it appears that it was not God who in person spoke to Moses, but an angel representing Him, and speaking in His Name; as when he said, “I am the Lord thy God.” Even so an ambassador speaks in the name of his sovereign, and acts by his authority. It was then an Angel who, in the place of God, was the immediate giver of the Decalogue to the people on Mount Sinai. It was an Angel also who spoke with Moses on Mount Sinai, and gave him for promulgation to the people the ceremonial laws, with directions for the making of the Tabernacle, for the ark, the cherubim, the sacrifices, and expiatory rites, which are found scattered throughout the Pentateuch.
In the hand of a mediator. Hand is here used to denote instrumentality . By a similar usage the word of the Lord is said to have come to pass in the hand of Elijah, Isaiah, and other prophets, acting as the instruments of God. Vatablus has for mediator intercessor , and Erasmus conciliator. But mediator, as the more intensive term, is preferable. Whoever mediates between two may be either a messenger, or an interpreter, or a peacemaker, and in each sense he is a mediator.
What mediator is referred to here? 1. Jerome, Augustine, Chrysostom, and Ambrose reply, Christ the Lord. Although Christ was not then actually our mediator, yet He was by the decree and in the purpose of God. The Old Law, in this sense, was given by the power and authority of Christ, who was the predestined Mediator; and since, therefore, the law was given by His authority, so when He was born into the world it was in His power to abrogate it.
2. The answer of Cyril ( Thesauri , xii. 10), Gregory Nazianzen (Orat. 6 before Greg. Nyss.), Catharinus, Adam, and others, including even Beza, is better, viz., that the mediator was Moses, who himself says, in Deuteronomy v. 5, that he stood between the Lord and the people at that time. This opinion is supported by the consideration (a) that Christ cannot be said to be a mediator as God, but only as God-made-man. But at the time of Moses He was not yet made man, and therefore could not then be called a mediator. The major of this syllogism is proved thus : Christ as God only, just as Christ as man only, is but one of two extremes ; therefore as such He cannot be a mediator, but only as God-man.
As the God-man He unites in His person the two extremes of God and man. As God He had the authority and dignity belonging to a mediator ; as man He did the work of a mediator. It may be objected to this, no doubt, that though Christ was not then actually a mediator, yet He was by predestination. But this objection loses sight of the fact that the Apostle is not speaking of a mediator by predestination, but of an acting mediator ; for he says that the Old Law was ordained by this mediator, in very deed, when it was given to the Hebrews. But Christ, not yet existing as mediator, could not have ordained the law at that time ; therefore He was not its mediator, for what has no existence can neither work nor ordain anything.
(b) The phrase of S. Paul means that angels gave the law by the instrumentality of a mediator. But Christ cannot be said to be the minister of angels but their Prince (cf. Heb. i.) : therefore, the mediator here is not Christ. (c) Again, the Old Law was given , as the New Law by Christ. As, then, Christ is the mediator of the New Law and the New Covenant, so was Moses of the old. (d) Lastly, that Moses was the mediator is clear from
Observe, in opposition to the Protestants, that if Moses could be called a mediator without any derogation from the mediatorial office of Christ, as even Beza admits, in the sense, not of a redeemer or reconciliator, but as a messenger from one to the other, why may not the Saints with even better title be called mediators without offence to Christ, seeing that by their merits and prayers they gain for us the grace of God ? It is astonishing that Protestants should make so much fuss about this word, and strive to throw so much dust in people’s eyes, when, as is evident, there is no difference between us, either about the name or the thing.
The meaning of the Apostle, then, is this : The Old Law was given and promulgated by Moses, the New by Christ Himself. He who as God used the instrumentality of Moses in proclaiming the Old Law, could, when made man, abrogate it in His own person, in order that the promise made to Abraham, that all nations should be justified, might be fulfilled in Himself, the seed of Abraham.
Ver. 20 . — Now a mediator is not a mediator of one , but of two, in this case of two peoples, Jews and Gentiles, to whom Christ acts as mediator, says Ambrose. (2.) Or, Christ is not a mediator of one nature, but of two, the Divine and the human. (3.) Or, Moses is not a mediator of one will and purpose, because as a man he was subject to change. God on the contrary is unchangeable in His will and promise. Adam leans to this explanation. But all these are beside the phraseology of Scripture and the drift of the Apostle.
(4.) A better interpretation is that Christ is a mediator not of one but of two — not of two Gods, as though Father and Son make two, according to the heresy of Arius and Nestorius — not between God and angels, for the good angels need no mediator, and the evil angels cannot derive any benefit from one — but He is a mediator between the two parties, God on one side and man on the other. And the inference drawn is that it is not the law, but Christ, that redeems us and reconciles us to God. This explanation is supported by Theophylact, Anselm.
(5.) The best interpretation of the clause is that the Apostle is explaining the character of a mediator. The mediator Moses, he seems to say, is not of one but of two determinate parties, viz., God and the Hebrews, but not of God and Christians. On the other hand, God is One, not two. The Apostle is not building his argument on these words, except indirectly, but is merely contrasting the dual character of a mediator with the unity of God. It is on this latter fact that he relies to prove his case.
But God is one. There are not two Gods, one of whom is the God of the law and of the Jews, the other of Abraham and of Christians, as the Manichæans have thought, but the God of Jews and of Christians is one and the same — the law and the Gospel proceed from the same Author. Accordingly, it being the same God, He could not intend that the law should annul His promise to Abraham of giving His righteousness to all nations in Abraham's seed, i.e., in Christ, or, in other words, through faith in Him ; else would He be inconstant, the very thought of which is impious.
Rather He gave the law to be our pedagogue to Christ. It is, therefore one and the same God who made Moses the mediator between Himself and the Hebrews; and, when he was superseded, between Himself and Christians of all nations, and so fulfilled His promise to Abraham, that He would give through Christ the blessing of justification to all nations.
This interpretation is confirmed by the parallel passage in 1 Tim. ii. 5, where, from the fact that the same God is God of all nations, the Apostle proves that He wishes all men to be saved, and from the same principle he infers that there is one mediator between God and men, the man Christ Jesus. God, he argues, does not wish for the salvation of the Jews only, but of all nations. Again, not only the Jews, but all nations have fallen into sin, and stand in need of a redeemer. This cannot be Moses, for he was mediator to the Jews only ; therefore it must be Christ. Moses, therefore, must give way to Him, as the seed promised to Abraham, in whom all nations should be blessed. So Gennadius in Œcumenius, and, following him, Salmeron.