Grace, mercy, and peace to you from God our Father and our Lord Jesus Christ.

You just heard Luther’s explanation of the fifth petition. And I want to sit with one line from it: “We are not worthy of anything we ask, neither have we deserved it; but we pray that He would give it to us out of His mercy; for we sin every day, and deserve nothing but punishment.”

That is an honest statement. We are not worthy. We have not deserved forgiveness. And what we do deserve is punishment. Luther does not soften that. He does not say “we occasionally fall short” or “we sometimes make mistakes.” He says we sin every day, and we deserve nothing but punishment. That is where this petition starts — with the truth about us.

But then the catechism does not leave us there. It goes on: “And we on our part will heartily forgive those who have sinned against us, and return good for evil.” There is a movement in the petition — from receiving to giving. From what God does for us to what that forgiveness produces in us. And that second part is where it gets complicated. Because forgiveness sounds simple until you have to do it. It sounds simple until the person who wronged you is someone you see every week, or someone in your own family, or someone who did something so terrible that you do not know where to begin.

In Matthew 18, Jesus gives us one of the richest teachings on forgiveness anywhere in Scripture. And I want to start tonight where the catechism starts — not with what we must do, but with what God has done.

Peter asks Jesus a question in verse 21: “Lord, how often will my brother sin against me, and I forgive him? As many as seven times?” Peter probably thinks he is being very generous. The rabbis of his day taught that forgiving someone three times was sufficient. Peter doubles it and adds one. Seven times. That sounds like a lot.

And Jesus says, “I do not say to you seven times, but seventy-seven times.”

Now, whether that means seventy-seven or seventy times seven — the Greek can be read either way — the point is the same: stop counting. If you are keeping track of how many times you have forgiven someone, you have missed the point entirely. Forgiveness is not a ledger for managing a budget or an accounting report. It is a way of life.

But why? Why should we stop counting? Jesus answers that with a parable, and the parable changes the whole scale. He zooms out from the everyday — from Peter’s question about how many times — to the cosmic. He shows us what our debt before God actually looks like, and the number he picks is staggering.

A king settles accounts with his servants. One servant owes the king ten thousand talents. Now, we need to understand how much money this is, because the whole parable depends on it. Scholars who have studied the ancient economy tell us that a single talent was worth about six thousand denarii, and a denarius was a day’s wage for a common laborer. So one talent is roughly sixteen years of full-time work. Ten thousand talents, then, is about one hundred and sixty thousand years of wages. The closest thing we have to this in our experience might be a thirty-year mortgage — or a long-term student loan — and many of us know the weight of that. But imagine a debt that would take you not thirty years but a hundred and sixty thousand years to pay off. That is the number Jesus chose, and he chose it on purpose. It is absurd. It is unpayable. You cannot work this off. You cannot earn your way out. The debt is beyond anything a human being could ever settle.

And this is a picture of our debt before God. We owe God perfect love, perfect obedience, perfect trust — and we have not given any of it. Not a little bit short. Not a few mistakes here and there. We owe a debt so large that there is nothing we can do about it.

The servant falls on his face and begs: “Have patience with me, and I will pay you everything.” But he will not. He cannot. That is a desperate promise from a desperate man. Compare this with David in our Psalm reading tonight. David does not promise to pay God back. He does not say, “Give me time and I will make it right.” He says, “Have mercy on me, O God, according to your steadfast love” (Psalm 51:1). David knows he cannot repay. He does not even try. He just throws himself on God’s mercy. The servant in the parable has not learned that yet. He still thinks he can fix this himself.

And the king does something remarkable. He does not give the servant more time. He does not renegotiate the terms. He forgives the entire debt. All of it. Gone.

And the word Matthew uses to describe the king in this moment is worth knowing. The Greek word is σπλαγχνισθείς — splanchnistheis, pronounced roughly “splonk-NEES-thice.” It means the king was moved with compassion — but not just in his head. This is a gut-level word. It describes something that grabs you in the stomach, something you feel in your whole body. It is the same word used when Jesus saw the crowds and had compassion on them. It is the same word used when the father saw the prodigal son coming home from a long way off and ran to meet him. This is how God feels about you when you pray “forgive us our trespasses.” Not reluctant. Not annoyed. Not cold and calculating. Moved in his gut with mercy.

And this compassion is not a gamble — not just hoping that we will improve or get better. The apostle John tells us in the epistle lesson for today that God is “faithful and just to forgive us our sins” (1 John 1:9). Faithful — because he has promised to forgive, and he keeps his promises. And just — because Christ has already paid the debt on the cross. The king’s compassion is backed by Calvary.

But now comes the terrible part of the parable. That same servant — the one who was just forgiven a hundred and sixty thousand years’ worth of debt — goes out and finds a fellow servant who owes him a hundred denarii. About three months’ wages. A real debt, but compared to what he was just forgiven, almost invisible. And he grabs the man by the throat and says, “Pay what you owe.” And he has him thrown into prison.

When the king finds out, he calls the servant back and asks one question: “Should not you have had mercy on your fellow servant, as I had mercy on you?”

There is that word: as. In the Greek it is hos — ὡς — and it is the exact same word Jesus uses in the Lord’s Prayer in Matthew 6:12: “Forgive us our debts, hos we also have forgiven our debtors.” The same word. The parable is dramatizing what the fifth petition assumes. And it does not mean that our forgiving is what earns God’s forgiveness. It means that if we have truly received God’s forgiveness — if the weight of ten thousand talents has actually been lifted off our shoulders — then it will show. It will flow through us. Our forgiving others is the fruit of having been forgiven. And when someone cannot forgive, it is often because the king’s mercy has not really sunk in. They heard the words, but they walked out of the throne room unchanged.

It is the same problem Joseph’s brothers had in our Old Testament reading. Joseph’s brothers had sold him into slavery decades earlier. But God raised Joseph up in Egypt, and when the family was reunited, Joseph forgave them. He wept over them, embraced them, and gave them the best land in Egypt. They had been living under his care and provision for seventeen years. Seventeen years of daily kindness. And yet when their father Jacob died, they were terrified that Joseph would finally take his revenge. After seventeen years of evidence to the contrary, they still could not believe the forgiveness was real.

So the parable tells us what God has done — he has forgiven us a debt beyond all reckoning, out of gut-level compassion, backed by the cross. And the parable warns us that refusing to forgive is a sign that this mercy has not sunk in.

Now, Luther says something very helpful about this in the Large Catechism. He writes that God “forgives freely and without condition, out of pure grace, because He has so promised, as the Gospel teaches — but He has set this up as a confirmation and assurance, as a sign alongside the promise.” Do you hear that? Our forgiving others is not what earns God’s forgiveness. God forgives freely. But our willingness to forgive is a sign — a confirmation — that we have received what God has given. Like Baptism is a visible sign of an invisible grace, our forgiving heart is a daily, portable sign that God’s mercy has actually taken root in us.

That is what the “as” in the fifth petition means. Not “God will forgive you because you forgive others.” But “when you forgive others, that is a sign that God’s forgiveness has landed in you.” And when you cannot forgive — that is a warning sign that something has not yet sunk in.

But in real life, this gets complicated. And we need to be honest about that.

The first thing we need to understand is a distinction that many people miss: forgiveness and trust are not the same thing.

Forgiveness means releasing the debt. It means you stop holding court over someone’s sin. You stop rehearsing the offense in your mind. You entrust the judgment to God. Joseph said it well: “Am I in the place of God?” (Genesis 50:19). That is forgiveness. And forgiveness can happen in a moment. You can decide right now to release a debt you have been carrying for years.

Trust is different. Trust is built over time through repentance, through changed behavior, through demonstrated faithfulness. Trust has to be earned back. And sometimes it cannot be fully restored. That is not a failure of forgiveness. That is just the reality of living in a fallen world.

With that distinction in mind, think about the range of situations we actually face.

At one end, there are the everyday offenses. The hundred-denarii debts. The unkind word, the thoughtless comment, the small slight. These are real, but they are small. And Jesus says: stop counting. Let them go. Do not keep a ledger. As Stephen Larson talked about last Wednesday, this can be even a form of daily bread of the fifth petition — small, ordinary, constant forgiveness that keeps daily life together in families, in churches, in workplaces, in clubs. It is not glamorous. It is not dramatic. But it is essential.

Then there is the middle of the spectrum. The person who keeps doing the same harmful thing. The family member who manipulates. The person who apologizes but never changes. The relationship that is unjust, or that needs to grow in holiness in some way, or maybe even a person who needs help for a long struggle like depression — help that you as a family member may not be equipped to give. How many times do we forgive? Still seventy-seven. You still release the debt. You do not carry the bitterness. You do not sit in God’s chair and play judge. But forgiving does not mean you keep putting yourself back in harm’s way. You can forgive someone and set a boundary. You can forgive someone and limit your contact with them — and in fact, this is what Jesus has in mind when he says to let someone “be to you as a Gentile and a tax collector.” You can love someone and still say, “I cannot keep doing this.” That is not unforgiveness. That is wisdom. When the people in his hometown of Nazareth rejected his teaching, Jesus “passed through the midst of them and went away” (Luke 4:30). He still loved Nazareth. But he did not stay where his word was refused.

And then there is the far end of the spectrum. The grievous sin. The crime that changes everything. The abuse of a child. The betrayal that destroyed a family. Here the fifth petition still applies — you release the person from your personal court, you refuse to let the rage eat you alive, you entrust the justice to God, who is a far better judge than any of us. But the boundaries here are not optional. They are required. Protecting the vulnerable is not the opposite of forgiveness. It is love. And thankfully, God also ordains the governing authorities, as Paul teaches in Romans 13, and their work can be a common grace that aids in holding these boundaries — whether through restraining orders, prison sentences, or other measures that protect the innocent. These are not opposed to forgiveness. They are part of God’s provision for a fallen world.

Earlier in Matthew 18, just a few verses before the parable, Jesus says: “Whoever causes one of these little ones who believe in me to sin, it would be better for him to have a great millstone fastened around his neck and to be drowned in the depth of the sea” (Matthew 18:6). Now, the word “sin” there is skandalizo in the Greek — it means to set a trap, to cause someone to stumble and fall away from faith. Jesus is warning about anything that would destroy the faith of a child or a vulnerable believer. That is the specific danger he has in mind, and it is the most serious warning in the chapter.

But here is what we must hold together: that same Jesus, in that same chapter, also says “forgive seventy-seven times.” There is salvation for every sinner — Christ died for all. The blood of Jesus covers even the most grievous sins, and the door of repentance is never shut from God’s side. But the severity of this warning tells us something important about boundaries. When someone’s actions have caused this kind of damage — whether to a child’s faith, to a child’s safety, to a family’s trust — the boundaries are not optional. Forgiveness releases the debt to God. It does not remove consequences. It does not restore access to the people who were harmed. And it does not pressure victims to move on before they are ready, for the sake of keeping the peace.

David’s prayer in Psalm 51 shows us what genuine repentance looks like on the other side. “Against you, you only, have I sinned, and done what is evil in your sight” (v.4). David did not demand that everyone go back to treating him as though nothing had happened. He submitted to God’s judgment. He accepted the consequences. A truly repentant person does not insist that all the boundaries come down. A truly repentant person understands why they are there.

Now, Jesus does not leave us without practical help. Back in verses 15 through 17, before the parable, he lays out a process for when a brother or sister in the church sins against you. It is worth noting that Jesus is talking here about fellow believers — people within the community of faith. The situation is different when we are dealing with someone outside the church, because they are not under the same accountability and they have not made the same confession. But within the body of Christ, Jesus gives us a clear process.

Step one: go to the person privately, just the two of you. Not to a third party. Not in a group text. Not to everyone else at coffee hour. Go to the person directly, face to face, and tell them what they did. This is hard to do. Most of us would rather talk about the person than talk to them. But Jesus does not give us that option.

Step two: if they will not listen, bring one or two others along. Not to gang up on the person. But for clarity and accountability, so that the conversation is fair and honest.

Step three: if they still will not listen, bring it to the church.

Step four: if they still refuse to hear — Jesus says, “Let him be to you as a Gentile and a tax collector.”

Now, what does that mean? Think about how Jesus treated Gentiles and tax collectors. He loved them. He ate with them. He sought them out. He called Matthew the tax collector to be one of his own disciples. So “let him be to you as a Gentile and a tax collector” does not mean hate them. It means the relationship has changed. They are no longer in the inner circle of trust. You still love them. You still pray for them. But you do not pretend the sin is resolved when it is not. Sometimes that means teaching your children something different than what that person teaches, because you are going with God’s Word and not the world’s word. Sometimes it means limiting contact but still wanting to stay in touch — still being willing to sit down together and check in. It may mean deciding that your children should not be around that person, or around their household, until things change. That is a painful decision. But it is not un-Christian. Jesus himself provides for it right here.

This is the process that fits the spectrum we just talked about. For the everyday offenses, you may not even need step one — you just let it go. For the repeated patterns, you go to the person and work through the steps. And for the grievous situations, the process may reach its end in step four — and that is where the boundaries hold. At every level, forgiveness is real. But what it looks like in practice changes depending on the situation.

Luther ends his explanation of the fifth petition with a small word that is easy to miss. He says: “And we on our part will heartily forgive those who have sinned against us, and return good for evil.”

Heartily. Not grudgingly. Not through gritted teeth. Not because we have to. Heartily. And the only way that word makes sense — the only way forgiving someone could ever be a hearty thing — is if the king’s mercy has truly sunk in. If you know what you have been forgiven, then releasing someone else’s debt is not a burden. It is a relief. It is the weight coming off. It is walking out of the throne room and actually believing that the hundred and sixty thousand years are gone.

Joseph knew this. His brothers had sold him into slavery decades earlier. They had lived under his care for seventeen years and still could not believe the forgiveness was real. And Joseph said to them: “Do not fear, for am I in the place of God?” (Genesis 50:19).

You are not in the place of God. You do not have to be. The king who was moved with σπλαγχνισθείς (splonk-NEES-thice) — that gut-level, stomach-deep compassion — that king has canceled your debt. He is faithful. He is just. Christ has paid. And because he has, you can forgive. Not perfectly. Not without struggle. But gladly. Because the one who forgives you is the one who frees you.

Forgive us our trespasses, as we forgive those who trespass against us.

Now may the peace of God, which passes all understanding, guard your hearts and minds in Christ Jesus. Amen.