From this passage it is manifest that the power of the Son and Spirit is one, for being commissioned by the Spirit, he says that he was commissioned by Christ. This appears in another place, from his ascription of the things of God to the Spirit, in the words which he addresses to the elders at Miletus: “Take heed unto yourselves, and to all the flock, in the which the Holy Ghost has made you bishops.” Yet in another Epistle he says, “And God has set some in the Church, first Apostles, secondly prophets, thirdly teachers.” Thus he ascribes indifferently the things of the Spirit to God, and the things of God to the Spirit. Here too he stops the mouths of heretics, by the words “through Jesus Christ and God the Father;” for, inasmuch as they said this term “through” was applied to the Son as importing inferiority, see what he does. He ascribes it to the Father, thus teaching us not to prescribe laws to the ineffable Nature, nor define the degrees of Godhead which belong to the Father and Son. For to the words “through Jesus Christ” he has added, “and God the Father;” for if at the mention of the Father alone he had introduced the phrase “through whom,” they might have argued sophistically that it was peculiarly applicable to the Father, in that the acts of the Son were to be referred to Him. But he leaves no opening for this cavil, by mentioning at once both the Son and the Father, and making his language apply to both. This he does, not as referring the acts of the Son to the Father, but to show that the expression implies no distinction of Essence. Further, what can now be said by those, who have gathered a notion of inferiority from the Baptismal formula,— from our being baptized into the name of the Father, Son, and Holy Spirit? For if the Son be inferior because He is named after the Father, what will they say seeing that, in the passage before us, the Apostle beginning from Christ proceeds to mention the Father?— but let us not even utter such a blasphemy, let us not swerve from the truth in our contention with them; rather let us preserve, even if they rave ten thousand times, the due measures of reverence. Since then it would be the height of madness and impiety to argue that the Son was greater than the Father because Christ was first named, so we dare not hold that the Son is inferior to the Father, because He is placed after Him in the Baptismal formula.
“Who raised Him from the dead.”
Wherefore is it, O Paul, that, wishing to bring these Judaizers to the faith, you introduce none of those great and illustrious topics which occur in your Epistle to the Philippians, as, “Who, being in the form of God, counted it not a prize to be on an equality with God,” or which you afterwards declared in that to the Hebrews, “the effulgence of his glory, and the very image of His substance;” or again, what in the opening of his Gospel the son of thunder sounded forth, “In the beginning was the Word, and the Word was with God, and the Word was God;” or what Jesus Himself oftentimes declared to the Jews, “that His power and authority was equal to the Father's?” Do you omit all these, and make mention of the economy of His Incarnation only, bringing forward His cross and dying? “Yes,” would Paul answer. For had this discourse been addressed to those who had unworthy conceptions of Christ, it would have been well to mention those things; but, inasmuch as the disturbance comes from persons who fear to incur punishment should they abandon the Law, he therefore mentions that whereby all need of the Law is excluded, I mean the benefit conferred on all through the Cross and the Resurrection. To have said that “in the beginning was the Word,” and that “He was in the form of God, and made Himself equal with God,” and the like, would have declared the divinity of the Word, but would have contributed nothing to the matter in hand. Whereas it was highly pertinent thereto to add, “Who raised Him from the dead,” for our chiefest benefit was thus brought to remembrance, and men in general are less interested by discourses concerning the majesty of God, than by those which set forth the benefits which come to mankind. Wherefore, omitting the former topic, he discourses of the benefits which had been conferred on us.
But here the heretics insultingly exclaim, “Lo, the Father raises the Son!” For when once infected, they are wilfully deaf to all sublimer doctrines; and taking by itself and insisting on what is of a less exalted nature, and expressed in less exalted terms, either on account of the Son's humanity, or in honor of the Father, or for some other temporary purpose, they outrage, I will not say the Scripture, but themselves. I would fain ask such persons, why they say this? Do they hope to prove the Son weak and powerless to raise one body? Nay, verily, faith in Him enabled the very shadows of those who believed in Him to effect the resurrection of the dead. Then believers in Him, though mortal, yet by the very shadows of their earthly bodies, and by the garments which had touched these bodies, could raise the dead, but He could not raise Himself? Is not this manifest madness, a great stretch of folly? Have you not heard His saying, “Destroy this Temple, and in three days I will raise it up?” and again, “I have power to lay down my life, and I have power to take it again?” Wherefore then is the Father said to have raised Him up, as also to have done other things which the Son Himself did? It is in honor of the Father, and in compassion to the weakness of the hearers.
“And all the brethren which are with me.”
Why is it that he has on no other occasion in sending an epistle added this phrase? For either he puts his own name only or that of two or three others, but here has mentioned the whole number and so has mentioned no one by name.
On what account then does he this?
They made the slanderous charge that he was singular in his preaching, and desired to introduce novelty in Christian teaching. Wishing therefore to remove their suspicion, and to show he had many to support him in his doctrine, he has associated with himself “the brethren,” to show that what he wrote he wrote with their accord.
“Unto the Churches of Galatia.”
Thus it appears, that the flame of error had spread over not one or two cities merely, but the whole Galatian people. Consider too the grave indignation contained in the phrase, “unto the Churches of Galatia:” he does not say, “to the beloved” or “to the sanctified,” and this omission of all names of affection or respect, and this speaking of them as a society merely, without the addition “Churches of God,” for it is simply “Churches of Galatia,” is strongly expressive of deep concern and sorrow. Here at the outset, as well as elsewhere, he attacks their irregularities, and therefore gives them the name of “Churches,” in order to shame them, and reduce them to unity. For persons split into many parties cannot properly claim this appellation, for the name of “Church” is a name of harmony and concord.
“Grace to you and peace from God the Father, and our Lord Jesus Christ.”
This he always mentions as indispensible, and in this Epistle to the Galatians especially; for since they were in danger of falling from grace he prays that they may recover it again, and since they had come to be at war with God, he beseeches God to restore them to the same peace.
“God the Father.”
Source: Commentary on Galatians (New Advent)