Why the Law? Christ's Promise and Our Need

Galatians 3 sets the promise of Christ before the law and then raises the obvious question: “Why then the law?” Paul knows that if the promise is the thing, and Christ is the promised offspring, then the law must have a purpose that does not replace grace. The law was “added,” not to correct the promise or improve the promise, but to come alongside it because of transgressions. The law did not interrupt grace. The law served grace by underlining the existence and extent of sin.

The law reveals sin with an objective standard. Conscience can be confused, hardened, or shaped by culture, but God gives a standard because God is the judge. The scale does not cause the weight gain, it just ends the argument. The speed limit sign does not create speeding, but after the sign says 55 and the car is doing 85, the issue becomes a lot less philosophical. The law names sin as transgression, not merely weakness, immaturity, or poor judgment. Sin crosses a boundary established by God.

The law also restrains sin, but the law cannot change the heart. The law can tell a thief not to steal, but it cannot remove greed. The law can forbid murder, but it cannot create love. The law can condemn adultery, but it cannot produce faithfulness. Christ alone transforms the heart. The law was temporary in its Mosaic role, serving “until the offspring should come,” and that offspring is Christ. The law was not the destination. The law was a sign pointing toward the destination.

Paul also shows that the law came through a mediator. Angels were involved, Moses stood between God and Israel, and the people stood at a distance. The promise, however, was direct. “God is one” means God does not make a counteroffer, meet sinners halfway, or set up a bargain where salvation depends on perfect performance. God obligates himself to save on the basis of his promise, sealed in blood through his only begotten Son.

The law and the promise do not contradict each other. The law reveals what righteousness requires, and the promise gives righteousness through faith in Christ. The problem is not that the law is bad. The problem is sinful humanity cannot keep it. Religion stinks when it says, dress up, attend, behave, and maybe everything will be okay. The gospel says Christ forgives every sin, including every sin God already knows, and Christ alone cleanses the drowning soul that cannot even cry for help.

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Key Takeaways

• 1. The law ends the argument The law does not cause sin, but the law names sin with God’s own standard. Sin loses the ability to hide behind preference, culture, personality, or ignorance. The scale simply ends the argument, and the law does the same before God. [39:09]
• 2. Sin is more than weakness Sin is transgression, a crossing of the boundary God himself established. The language matters because “mistake” can soften what “sin” exposes. Honest confession begins where renaming stops. [45:22]
• 3. The law cannot change hearts The law can restrain evil, but the law cannot produce love, faithfulness, or purity inside a person. Commandments can fence in behavior, but Christ alone transforms desire. The heart needs more than limits; the heart needs resurrection grace. [43:15]
• 4. God’s promise is not a bargain The promise rests on God’s character, not human performance. God does not negotiate salvation like a contract with two obligated parties. The gospel stands as a one way gift, sealed by the blood of Christ, not by the strength of obedience. [49:33]
• 5. Drowning souls need Jesus Lostness is often quieter than expected, like a drowning person who cannot scream. Sin can leave a soul helpless right in front of open eyes. Christ alone forgives completely, and Christ alone rescues the one who cannot rescue himself.
  
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Youtube Chapters

• [00:00] - Welcome
• [30:26] - Galatians 3 and the Question of Law
• [31:31] - The Promise of Christ
• [32:16] - Religious Order and Holy Stairs
• [35:44] - The Law Added Because of Sin
• [36:35] - The Law Reveals Sin
• [39:09] - Sin as Transgression
• [43:15] - Law Restrains but Cannot Transform
• [44:28] - Until Christ Came
• [46:30] - Law Given Through a Mediator
• [49:33] - God’s Unilateral Promise
• [54:15] - Law and Promise Do Not Compete
• [58:13] - Drowning People Need Rescue
• [61:07] - Come to Jesus for Forgiveness

Bible Reading

Galatians 3:19-29
“Why then the law? It was added because of transgressions, until the offspring should come to whom the promise had been made, and it was put in place through angels by an intermediary. Now an intermediary implies more than one, but God is one. Is the law then contrary to the promises of God? Certainly not! For if a law had been given that could give life, then righteousness would indeed be by the law. But the Scripture imprisoned everything under sin, so that the promise by faith in Jesus Christ might be given to those who believe. Now before faith came, we were held captive under the law, imprisoned until the coming faith would be revealed. So then, the law was our guardian until Christ came, in order that we might be justified by faith. But now that faith has come, we are no longer under a guardian, for in Christ Jesus you are all sons of God, through faith. For as many of you as were baptized into Christ have put on Christ. There is neither Jew nor Greek, there is neither slave nor free, there is no male and female, for you are all one in Christ Jesus. And if you are Christ's, then you are Abraham's offspring, heirs according to promise.” [30:26]

Romans 3:20
“For by works of the law no human being will be justified in his sight, since through the law comes knowledge of sin.” [37:20]

Hebrews 2:2
“For since the message declared by angels proved to be reliable, and every transgression or disobedience received a just retribution,”

Revelation 13:8
“and all who dwell on earth will worship it, everyone whose name has not been written before the foundation of the world in the book of life of the Lamb who was slain.” [55:06]

Observation questions

1. In Galatians 3:19, what reasons are given for the law being added, and how long does Paul say that role lasts? [35:44]
2. What words or images help show the difference between sin as a vague problem and sin as “transgression” against God’s standard? [39:09]
3. According to Galatians 3:19-20, who was involved in the giving of the law, and how is that different from the way the promise is described? [46:30]
4. In Galatians 3:21 and Romans 3:20, what can the law do, and what can it not do? [54:15]

Interpretation questions

1. Paul says the law was “added because of transgressions.” Why would God give something that exposes sin so clearly if the law itself cannot save? [36:35]
2. If the law can restrain outward evil but cannot change the heart, what does that reveal about the real depth of the human problem? [43:15]
3. Paul says “God is one” right after talking about a mediator. How does that help explain why salvation is based on God’s promise rather than a negotiated arrangement with human performance? [49:33]
4. If the law and the promise are not enemies, how do they work together to lead a person to Christ rather than away from him? [57:30]

Application questions

1. Sin often gets renamed as weakness, stress, personality, or a mistake. Where is there a temptation right now to soften what should simply be confessed as sin? [45:22]
2. The law ends the argument by giving God’s standard. In what area of life is there still a tendency to defend, explain, or compare instead of agreeing with God honestly? [39:09]
3. Rules can restrain behavior without changing the heart. Is there a place where outward control has replaced inward repentance—where things may look better on the surface, but greed, anger, lust, bitterness, or pride are still being protected underneath? [43:15]
4. God’s promise in Christ is not a bargain. When guilt rises, is there a tendency to think, “If I perform better, maybe God will accept me again”? What would it look like this week to rest in Christ instead of trying to negotiate with God? [49:33]
5. Obedience is the result of grace, not the price of grace. How might that truth change the way prayer, church attendance, giving, serving, or resisting temptation is approached this week? [53:51]
6. Drowning people are not always loud; sometimes they are quiet and sinking in plain sight. Who comes to mind right now that may be spiritually drowning, and what would it look like to move toward that person with compassion and point them to Jesus? [01:00:48]
7. Jesus alone forgives completely. For someone carrying shame, hiding failure, or feeling too far gone, what would it look like to come honestly to Christ instead of continuing to hide? [01:01:07]