Galatians 4:6

And because ye are sons
That is of God, so some copies read; and the Ethiopic version, "inasmuch as ye are his sons"; not in so high a sense as Christ is the Son of God; nor in so low a sense as all men are his offspring; nor in such sense as magistrates are the children of the most High; nor merely on account of a profession of religion, as the "sons of God" was a phrase very early used of the worshippers of the true God; but by virtue of adoption, and which is not owing to the merits of men, who are by nature children of wrath, but to the free rich sovereign grace of God. It is a privilege and blessing of grace in which all the three persons are concerned. The Father has predestinated to it, and in the covenant has provided and laid it up; he set up his Son as the pattern to which these sons should be conformed, and proposed the glory of his own grace, as the end; by virtue of which act of grace they were considered as the children of God, as early as the gift of them to Christ; and so by him when he partook of their flesh and blood, and died to gather them together who were scattered abroad; see ( Hebrews 2:13 Hebrews 2:14 ) ( John 11:52 ) . The Son of God has also an hand in this affair; for through his espousing their persons, they become the sons and daughters of the Lord God Almighty; and through his assumption of their nature they become his brethren, and so to be in the relation of sons to God; through his redemption they receive the adoption of children, and at his hands the privilege, the power itself, to become such. The Spirit of God not only regenerates them, which is an evidence of their sonship, but as a spirit of adoption manifests it to them, works faith in them to receive it, and frequently witnesses to the truth of it; all which show how any come and are known to be the sons of God. This is a privilege that exceeds all others; it is more to be a son than to be a saint; angels are saints, but not sons, they are servants; it is more to be a child of God, than to be redeemed, pardoned, and justified; it is great grace to redeem from slavery, to pardon criminals, and justify the ungodly; but it is another and an higher act of grace to make them sons; and which makes them infinitely more honourable, than to be the sons and daughters of the greatest potentate upon earth; yea, gives them an honour which Adam had not in innocence, nor the angels in heaven, who though sons by creation, yet not by adoption. The consequence, and so the evidence of it, follows,

God hath sent forth the Spirit of his Son into your hearts, crying
Abba, Father.
The Syriac and Arabic versions read, "our Father"; all the three divine persons here appear, as having a concern in this business, as before observed; here are God and his Son, and the Spirit of his Son, said to be sent; by whom is designed not any work of his upon the heart, nor any of his gifts and graces; but he himself in person, even the same Spirit of God that moved upon the face of the waters at the creation of the world, and moved holy men of God to write the Scriptures; who formed and filled the human nature of Christ, and descended on him as a dove; and by whom Christ and his apostles wrought their miracles; and who is called the Spirit of his Son; as he is frequently by the Jews ^F7, (xyvm Klm lv wxwr) , "the Spirit of the King Messiah"; and sometimes

F7 Bereshit Rabba, fol. 2. 4. & 6. 3. Vajikra Rabba, fol. 156. 4. (See Gill on Romans 8:9).
F8 Targum in 2 Chron. ii. 6.