Paul has just announced that Christ redeems us from the curse so that Abraham’s blessing and the promise of the Spirit may come to the nations. Now he stretches the reader across four hundred and thirty years. The long interval between promise and Law did not weaken God’s word, and the arrival of Sinai did not replace it. The promise came first, rests on God’s faithfulness, and reaches its fulfillment in Christ, the promised Seed.
Paul then gives the Law both dignity and limit. It was added because of transgressions and served until the Seed came. The command brings rebellion into the light, names the wound truthfully, and leaves the sinner without a false defense. Yet it cannot impart the life it commands. That distinction is the passage’s center: the Law is neither God’s mistake nor humanity’s physician. It serves the promise by exposing our need, while Christ alone gives life.
The Confirmed Promise and the One Seed (Galatians 3:15-18)
15 Brethren, I speak in the manner of men: Though it is only a man’s covenant, yet if it is confirmed, no one annuls or adds to it. 16 Now to Abraham and his Seed were the promises made. He does not say, “And to seeds,” as of many, but as of one, “And to your Seed,” who is Christ. 17 And this I say, that the law, which was four hundred and thirty years later, cannot annul the covenant that was confirmed before by God in Christ, that it should make the promise of no effect. 18 For if the inheritance is of the law, it is no longer of promise; but God gave it to Abraham by promise.
Paul begins with an ordinary human comparison. Once a covenant or disposition has been confirmed, another party does not casually cancel it or append new terms. The comparison has limits because God’s covenant with Abraham is not a bargain between equals. Yet the lesser case establishes the greater claim: if ratification carries weight among people, the promise confirmed by God cannot be treated as fragile.
Sinai enters a history already governed by promise. Exodus 12:40 in Brenton’s Septuagint counts four hundred and thirty years of sojourning “in the land of Egypt and the land of Chanaan”; the Hebrew text names Egypt alone.1 Including Canaan helps us understand Paul’s reckoning from promise to Law. His point is that the later command cannot cancel the earlier gift. God does not offer an inheritance to Abraham, then replace it with terms that make His promise ineffective.
Verse 16 identifies the goal: the Seed is Christ. The promise “to thy seed” appears in Brenton’s Genesis 13:15 and 17:8; Genesis 22:18 promises the blessing of the nations “in thy seed”.2 Like English offspring, Greek sperma can mean many descendants. The singular form does not mean that Abraham could have only one descendant. Paul gathers the promise in the Messiah. Those who belong to Christ will themselves be called Abraham’s seed and heirs according to promise (Galatians 3:29). The one Seed does not leave the many outside: He brings them into the inheritance in Himself.
This keeps the passage from turning against Abraham, Israel, Moses, or the Old Testament. Christ does not erase the promise’s history. He fulfills it. Gentile believers enter a blessing first spoken to Abraham and carried through Israel’s Scriptures. The right response is gratitude, not contempt toward the people through whom that promise came.
St Irenaeus reads the promise with a resurrection horizon. Abraham did not receive its fullness during his earthly sojourn; he and those who believe will receive the inheritance at the resurrection of the just.3 God’s gift is not merely a label for present belonging. It reaches toward the risen body and renewed creation. Waiting has not made the promise empty.
Why the Law Was Added (Galatians 3:19-20)
19 What purpose then does the law serve? It was added because of transgressions, till the Seed should come to whom the promise was made; and it was appointed through angels by the hand of a mediator. 20 Now a mediator does not mediate for one only, but God is one.
Paul voices the objection himself. If the Law cannot cancel the promise or provide the inheritance, why was it given? His answer gives the Law both purpose and boundary. It was added “because of transgressions,” and it served “till the Seed should come.” The Law belongs within God’s saving history, but it is not the source or final form of the inheritance.
Chrysostom begins with the Law’s real benefit: it was given “altogether profitably”.4 He calls it a bridle, restraining transgression and checking the descent into wickedness. A command names a boundary, calls wrongdoing what it is, and teaches the sinner to recognize the need for mercy. Restraint, exposure, and preparation belong together; none gives the Law the power to make the dead alive.
The Law is not God’s failed experiment or an evil rival to the Gospel. It tells the truth about good and evil and gives form to covenant obedience. Its limit is different: a true command can reveal what love requires without raising a heart bent by pride, fear, lust, envy, or anger. Knowing the good and receiving the life to do it are not the same gift.
The angels at Sinai have a scriptural background. Deuteronomy 33:2 in Brenton’s Septuagint says “on his right hand were his angels with him”.5 Acts 7:53 and Hebrews 2:2 likewise associate the giving of the Law with angels. Sinai is not a scene outside God’s saving care. The Law comes through heavenly ministry and serves a bounded purpose: “till the Seed should come”.
On the difficult words about a mediator, Chrysostom identifies the mediator as Christ, the Son who existed before the Law and gave it. A mediator stands between parties; in Chrysostom’s reading, Christ mediates between God and humanity.6 Moses is another common identification of the mediator in verse 19. Either way, the command is not a rival god’s work. Chrysostom also refuses to use “God is one” to exclude the Son from true divinity: the one God is not confessed by dividing the Father from His Son.
Later in this homily, Chrysostom likens the Law’s commandments to a fortress preserving a people until faith came. They trained conduct and brought sins into view. His candle-and-sun image makes the limit plain: the candle’s service at night is good, but it must not keep someone from daylight.7 These images honor the Law without asking it to do what only Christ can do.
The Law Cannot Give Life, but the Promise Is Given (Galatians 3:21-22)
21 Is the law then against the promises of God? Certainly not! For if there had been a law given which could have given life, truly righteousness would have been by the law. 22 But the Scripture has confined all under sin, that the promise by faith in Jesus Christ might be given to those who believe.
Paul rejects the claim that Law and promise are enemies: “Certainly not!” Their difference is one of power, not moral allegiance. If the Law could give life, righteousness would indeed come through it. But a command can address the living, restrain the unruly, and judge the transgressor. It cannot give resurrection life to the dead. That belongs to Christ.
“The Scripture has confined all under sin.” No one can appeal to ethnicity, comparison, achievement, or excuses as an exit from that judgment. Yet the sentence does not end in confinement: it ends in the promise given to believers. Scripture closes the exits of self-justification so that mercy can be received truthfully. Its verdict serves gift, not despair.
Paul says the promise is given “to those who believe”. Christ’s faithfulness and our response are not competing foundations. The Son gives Himself; we entrust ourselves to Him. Faith receives what the Law cannot produce, and the life received becomes obedience.
Gems from the Fathers 💎
Chrysostom gives the passage its clearest pastoral image. The Law was given, he says, “to probe their wounds, that they might long for a physician”.8 The command is not the wound and not the Physician. It uncovers what the sinner would rather hide. Christ then comes as the One who gives life, heals the wounded will, forgives sin, and makes obedience possible from within communion with Him.
Chrysostom therefore says the Law “was given for the promises”.8 Exposure is painful, but it can become the doorway to healing. The commandment is serving its purpose when the sinner stops hiding, seeks mercy, and learns obedience from Christ instead of trying to earn an inheritance.
Paul’s argument now stands at a threshold. Galatians 3:23-29 will name the Law’s bounded service as guardianship, then move from custody to sonship: faith in Christ, Baptism into Christ, being clothed with Christ, the unity of those who are one in Him, and the inheritance shared by Abraham’s seed. The Law’s inability to impart life is not the end of the argument. It clears the ground for the Son who gives His own life and makes heirs.
The Church’s Voice in Worship ⛪
At the Paramoune of the Nativity, the Church reads Galatians 3:15-4:18.9 The reading carries “till the Seed should come” forward to the Father sending His Son in the fullness of time. The woman of Galatians 4:4 is the Virgin Mary, the Theotokos: the promised Son truly takes flesh from her. On the eve of His Nativity, the Church hears the long history of waiting arrive at the promised Seed. The gift was not forgotten during the years of preparation.
Spiritual Fruit 🍇
Delay can breed suspicion
Abraham received a promise long before Sinai, and generations passed before Christ came. A delayed answer can make the heart rewrite God’s character. We begin to read silence as abandonment, a long struggle as proof that grace has failed, or a closed door as permission to seize control. Paul does not offer a timetable. He gives a firmer foundation: later events cannot make God’s promise ineffective.
Name one place where delay has become suspicion toward God. Pray without pretending the pain is small: “Lord, I do not see the fulfillment, but I refuse to call You unfaithful.” Then perform the next truthful act of obedience available today rather than trying to control the outcome.
Let the commandment name the wound
A commandment can expose anger protected as honesty, control excused as responsibility, envy hidden beneath criticism, or impurity defended as weakness that cannot change. The heart usually reaches first for an excuse, then for self-condemnation when the excuse fails. Chrysostom’s image gives a better response. The wound is probed so the sick person will seek the Physician.
In prayer or confession, name one repeated sin without defending it and without declaring yourself beyond mercy. Ask Christ for the opposite grace and choose one act that makes repentance visible. If anger was exposed, seek peace. If envy was exposed, bless the person you resented. If dishonesty was exposed, tell the truth and repair what you can.
Pressure cannot impart life
Many people know what obedience requires yet remain trapped in the same cycle: stronger resolutions, brief control, failure, shame, and another resolution. Paul names the limit without excusing the sin. The command is true, but it cannot impart life. Christ does more than intensify pressure. He forgives, heals the will, gives the Spirit, and makes a new obedience possible from communion with Him.
Before confronting one stubborn habit, stop trying to generate life by fear or pride. Pray, “Lord Jesus Christ, You alone make alive. Give me grace to do what You command.” Then use the concrete means of healing the Church gives: confession, prayer, counsel, restitution, accountability, and a next act of obedience. Receive them as cooperation with Christ’s life, not as a substitute for it.
Exposure is an opening to mercy
“The Scripture has confined all under sin” removes every ground for boasting, but Paul’s sentence does not end with confinement. It ends with the promise given to those who believe. Shame says that exposure is the signal to hide; the Gospel makes it the moment to come into the light. The room has no exit through self-justification, but Christ Himself comes to the sinner as gift.
When shame urges concealment, answer with the purpose of verse 22: the promise is given. Bring the truth into prayer, confession, and the Church’s healing life. Refuse both the lie that sin is harmless and the lie that mercy has become impossible.
Lord Jesus Christ, promised Seed and Giver of life, receive the truth I have been afraid to name. Teach me to honor Your commandments without hiding behind them, and to seek the healing You alone give. Amen.
Teaching Notes
The Confirmed Promise and the One Seed (Galatians 3:15-18)
- Ask: Why does Paul appeal to a confirmed human covenant before returning to God’s promise?
- Emphasize: The sequence protects gift. The promise precedes Sinai and reaches its christological goal in the Seed, Christ.
- Watch for: Treating a singular form as though it cannot be collective or using Christ to erase Abraham and Israel.
- Connect: Galatians 3:13-14 ended with redemption, Abraham’s blessing, and the Spirit. Galatians 3:23-29 will show those who belong to Christ sharing Abraham’s inheritance.
- Show: Use a simple line with three points: promise to Abraham, Law at Sinai, Christ the promised Seed. Label sequence, not replacement.
Why the Law Was Added (Galatians 3:19-20)
- Ask: What work can a true command perform, and what can it never produce by itself?
- Emphasize: The Law has a real, bounded purpose. It exposes and restrains transgression and prepares for Christ, but it neither cancels the promise nor imparts life.
- Watch for: Calling the Law evil or presenting one identification of the mediator as the only possible reading.
- Connect: Bring one exposed wound to Christ the Physician. The command names the sin truthfully, and Christ gives the life by which repentance becomes possible.
- Show: Compare restraint, diagnosis, and healing. The Law serves the first two; Christ gives life.
The Law Cannot Give Life, but the Promise Is Given (Galatians 3:21-22)
- Ask: How does Paul’s phrase “Certainly not!” govern the relation between Law and promise?
- Emphasize: The Law’s limitation is inability to make alive. Scripture’s confinement under sin serves the purpose of giving the promise to those who believe.
- Watch for: Turning conviction into despair or making faith an achievement independent of Christ’s gift.
- Connect: Hand the group directly into Galatians 3:23-29: bounded guardianship gives way to faith in Christ, Baptism into Christ, being clothed with Christ, sonship, unity, and inheritance according to promise.
- Practice: Read the purpose of verse 22 aloud before discussing what it means to be confined under sin.
Sources
Scripture is from NKJV. Old Testament excerpts follow Brenton’s English Septuagint.
St John Chrysostom, Homily 3 on Galatians, on Galatians 3:15-26: newadvent.org
St Irenaeus of Lyons, Against Heresies 5.32.2: ccel.org
Ernest DeWitt Burton, A Critical and Exegetical Commentary on the Epistle to the Galatians (ICC, 1920), on Galatians 3:15-22, pp. 180-198: archive.org
Coptic Orthodox lectionary, Paramoune of the Nativity: copticchurch.net
Footnotes
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Exodus 12:40, Brenton’s English Septuagint, ebible.org. ↩
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Genesis 13:15, 17:8, and 22:18, Brenton’s English Septuagint, ebible.org, ebible.org, and ebible.org. ↩
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St John Chrysostom, Homily 3 on Galatians, on Galatians 3:19, newadvent.org. ↩
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Deuteronomy 33:2, Brenton’s English Septuagint, ebible.org; Acts 7:53; Hebrews 2:2. ↩
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St John Chrysostom, Homily 3 on Galatians, on Galatians 3:19-20, newadvent.org. ↩
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St John Chrysostom, Homily 3 on Galatians, on Galatians 3:22-26, newadvent.org. ↩
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St John Chrysostom, Commentary on Galatians, Chapter III, on Galatians 3:21-22, ccel.org. ↩ ↩2
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Coptic Orthodox lectionary, Paramoune of the Nativity, Liturgy, Pauline reading Galatians 3:15-4:18, copticchurch.net. ↩