But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law, to redeem them that were under the law, that we might receive the adoption of sons. -Galatians 4:4,5

Beloved, prize redemption, and never listen to teaching which would destroy its meaning or lower its importance. Remember that ye were not redeemed with silver and gold, but with the precious blood of Christ, as of a lamb without blemish. You were under the law, and subject to its curse, for you had broken it most grievously, and you were subject to its penalty, for it is written, “the soul that sinneth, it shall die”; and yet again, “cursed is everyone that continueth not in all things that are written in the book of the law to do them.” You were also under the terror of the law, for you feared its wrath; and you were under its irritating power, for often when the commandment came, sin within you revived and you died. But now you are redeemed from all; as the Holy Ghost saith, “Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree.” Now ye are not under the law, but under grace, and this because Christ came under the law and kept it both by His active and His passive obedience, fulfilling all its commands and bearing all its penalty on your behalf and in your room and stead. Henceforth you are the redeemed of the Lord and enjoy a liberty which comes by no other way but that of the eternal ransom. Remember this; and whenever you feel most assured that you are a child of God, praise the redeeming blood; whenever your heart beats highest with love to your great Father, bless the “firstborn among many brethren,” who for your sakes came under the law, was circumcised, kept the law in His life, and bowed His head to it in His death, honouring, and magnifying the law, and making the justice and righteousness of God to be more conspicuous by His life than it would have been by the holiness of all mankind, and His justice to be more fully vindicated by His death that it would have been if all the world of sinners had been cast into hell. Glory be to our redeeming Lord, by whom we have received the adoption! ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1435.cfm

For ye are all the children of God by faith in Christ Jesus. – Galatians 3:26

Faith is the mark of sonship in all who have it, whoever they may be, for ye are all the children of God by faith in Christ Jesus. If you are believing in Jesus, whether you are Jew or Gentile, bond or free, you are a son of God. If you have only believed in Christ of late and have but for the past few weeks been able to rest in His great salvation, yet, beloved, now are you a child of God. It is not an after privilege, granted to assurance or growth in grace; it is an early blessing, and belongs to him who has the smallest degree of faith, and is no more than a babe in grace. If a man be a believer in Jesus Christ his name is in the register-book of the great family above, “for ye are all the children of God by faith in Christ Jesus.” But if you have no faith, no matter what zeal, no matter what works, no matter what knowledge, no matter what pretensions to holiness you may possess, you are nothing, and your religion is vain. Without faith in Christ you are as sounding brass and a tinkling cymbal, for without faith it is impossible to please God. Faith then, wherever it is found, is the infallible token of a child of God, and its absence is fatal to the claim.

Henceforth you are one in Christ, you wear his name, you live in him, you are saved by him, you are altogether his. Now, if you are one with Christ, since he is a son, you are sons also. If you have put on Christ God seeth you not in yourself but in Christ, and that which belongeth unto Christ belongeth also unto you, for if you be Christ’s then are you Abraham’s seed and heirs according to the promise. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1435.cfm

“The law was our schoolmaster to bring us unto Christ, that we might be justified by faith.” – Galatians 3:24

And because ye are sons… – Galatians 4:6

An unjustified man stands in the condition of a criminal, not of a child: his sin is laid to his charge, he is reckoned as unjust and unrighteous, as indeed he really is, and he is therefore a rebel against his king, and not a child enjoying his father’s love. But when faith realizes the cleansing power of the blood of atonement, and lays hold upon the righteousness of God in Christ Jesus, then the justified man becomes a son and a child. Justification and adoption always go together. “Whom He called them He also justified,” and the calling is a call to the Father’s house, and to a recognition of sonship. Believing brings forgiveness and justification through our Lord Jesus; it also brings adoption, for it is written, “But as many as received Him, to them gave He power to become the sons of God, even to them that believe on His name.”

“After that faith is come, we are no longer under a schoolmaster.” When we groaned under a sense of sin, and were shut up by it as in a prison, we feared that the law would punish us for our iniquity, and our life was made bitter with fear… but now that faith has come we see the law fulfilled in Christ, and ourselves justified and accepted in Him: this changes the slave into a child, and duty into choice. Now we delight in the law, and by the power of the Spirit we walk in holiness to the glory of God. Thus it is that by believing in Christ Jesus we escape from Moses, the taskmaster, and come to Jesus, the Saviour; we cease to regard God as an angry Judge and view Him as our loving Father. The system of merit and command, and punishment and fear, has given way to the rule of grace, gratitude, and love, and this new principle of government is one of the grand privileges of the children of God. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1435.cfm

And because ye are sons… – Galatians 4:6

Adoption gives us the rights of children, regeneration gives us the nature of children: we are partakers of both of these, for we are sons. Let us here observe that this sonship is a gift of grace received by faith. We are not the sons of God by nature in the sense here meant. We are in a sense “the offspring God” by nature, but this is very different from the sonship here described, which is the peculiar privilege of those who are born again. The Jews claimed to be of the family of God, but as their privileges came to them by the way of their fleshly birth, they are likened to Ishmael, who was born after the flesh, but who was cast out as the son of the bondwoman, and compelled to give way to the son of the promise. We have a sonship which does not come to us by nature, for we are “born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.” Our sonship comes by promise, by the operation of God as a special gift to a peculiar seed, set apart unto the Lord by His own sovereign grace, as Isaac was. This honour and privilege come to us, according to the connection of our text, by faith. Note well the twenty-sixth verse of the preceding chapter: “For ye are all the children of God by faith in Christ Jesus.” As unbelievers we know nothing of adoption. While we are under the law as self-righteous we know something of servitude, but we know nothing of sonship. It is only after that faith has come that we cease to be under the schoolmaster and rise out of our minority to take the privileges of the sons of God. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1435.cfm