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Boast Only in the Cross

Christ Alone

Mitchell Leach

Mitchell Leach

Sunday, March 15, 2026

Audio

Boast Only in the CrossMitchell Leach
00:00 / 34:04

Sermon Transcript

To all who are weary and need rest, to all who fail and desire strength, to all who mourn and long for comfort, to all who sin and need a Savior, this church opens wide her doors with a welcome from Christ Jesus, a friend to sinners. Welcome to an online gathering of Prosper Christian Reformed Church. And I can say this now preemptively, man, the roads are terrible out there. Can you believe this weather? We're pre-recording this on Saturday so that way when we needed it, because if you're seeing this, we did, because we canceled church because we— the weather was just so bad.

We wanted to include this last sermon in our Galatians series, Christ Alone, that really encompasses the totality of what we've been looking at in this series. And so we wanted to make sure that this was available for you because it goes along with the devotional series that we've been going through, the devotional plan that you've been going through, and we felt like this was a really good way to end this series. There will be some announcements that we'll send out in the email that comes along with this and some songs that you can sing at home that will go along with the service. But this is going to be an abbreviated message, abbreviated video service that will include the scripture reading and then the sermon. So let's jump into that scripture reading now.

Scripture Reading

Galatians 6:11-18

Hear the word of the Lord. See with what large letters I am writing to you with my own hand. It is those who want to make a good showing in the flesh who would force you to be circumcised, and only in order that they might not be persecuted for the cross of Christ. For even those who are circumcised do not themselves keep the law, but they desire to have you circumcised that they may boast in your flesh. But far be it for me to boast except in the cross of our Lord Jesus Christ, by which the world has been crucified to me and I to the world. For neither circumcision counts for anything, nor uncircumcision, but a new creation. And as for all who walk by this rule, peace and mercy be upon them and upon the Israel of God. From now on, let no one cause me trouble, for I bear on my body the marks of Jesus. The grace of our Lord Jesus Christ be with you. Be with your spirit, brothers. Amen.

In the past couple decades, baseball teams thought they knew exactly what made a good baseball team, what players made a good baseball team. They were certain of this. Things like batting average, pitching stats like ERA, RBIs, the look of a player, the sound that the bat made when it hit a ball. All of these things were key indicators that led a team to either choose or pass on a player, especially when replacing a player.

And then came the Moneyball era. If you've seen the movie Moneyball, you'll know what I'm talking about. This, this idea of replacing players, not as a one-for-one, but replacing them with maybe a couple different players that, that kind of Frankenstein their way into making the replacement that a team lost. This happened with the Oakland Athletics. They were a team that could not afford to compete with the New York Yankees, the team that had tons of money.

This team had hardly any. And so they figured out an algorithm, figured out an equation to make players, to make a team out of misfits, out of a team that really didn't seem to— that nobody wanted, players that nobody really wanted. And it worked. They were able to compete at a very high level and it changed the game of baseball. But it exposed something: old metrics were comforting but they were misleading.

Things that teams were certain of were exposed. Even though they gave them a sense of control, even though those old metrics or a sense of control for these teams, they didn't actually produce results. They didn't actually produce wins. And once they saw that, they realized that you can be sure of something, but you can still be wrong. And that's not just true for baseball; that's true for us.

You can be sure of things in your life and still be wrong. Because we all live based on a metric. We all have things that we try to trust in that tell us that we are okay. And that leads us into our big question for this morning: What are you sure of? What are you sure of?

Big Question

What are you sure of?

We all live on something that we are sure of. Everyone has a righteousness. Everyone has a metric. Everyone has a boast. The question is whether or not you can hold onto those things, those things can hold you, while you suffer, when you suffer.

If your certainty is built on performance, then your best day becomes your pride, will produce your pride, and your worst day will produce despair. Our culture offers dozens of different ways to produce these counterfeit certainties. Things like image: if I look put together, then I'm safe. Maybe it's morality. If I'm better than them, then I'm clean. It can be control. If I can plan it, then I can breathe. Maybe it's approval. If they like me, then I can feel secure. Maybe it's a religious marker. If I do the right things, if I obey the right laws, then God must accept me.

But the reality is all of these things have the same flaw. They cannot carry suffering, they cannot carry guilt, and they cannot carry death. They never give peace; only more rules, only more things to check off our list, only more bars to jump over. And that's why Paul says false teachers want to show a good showing in the flesh. They want something visible, something measurable, a metric, a ruler, a proof that they can point to. That says, "Now I'm sure." So the question is unavoidable: What are you certain of? What are you sure of? The good news is that Christianity is not guesswork. God speaks to us.

So keep your Bibles open to Galatians 6:11-18. We're going to see two major movements in this last sermon on Galatians. First, we're going to see false boasting exposed and then true boasting declared. This is the last all-encompassing kind of review of this sermon series that we've been going through in Galatians where we've been seeing Christ alone. That life in God starts in Christ Jesus, not in works. What we'll see in this passage is that the only legitimate boast for the Christian is the cross of Christ through which the world is crucified, a new creation has come, and peace belongs to those who walk by this gospel rule.

Outline

  1. False Boasting Exposed: Confidence in the Flesh (Galatians 6:11-13)

  2. True Boasting Declared: Confidence in the Cross (Galatians 6:14-18)

False Boasting Exposed: Confidence in the Flesh (Galatians 6:11-13)

The Apostle Paul starts off by showing what false confidence looks like in real time—religious performance under social pressure. And that's what we see in this first section, this first section, Galatians 6:11-13. I'm titling this False Boasting Exposed. Confidence in the flesh.

Let's look at Galatians 6:11. He says this: "See with what large letters I am writing to you with my own hand." Paul has been probably using a scribe to write most of this book and then he ends this last portion by writing it personally with his own hands. If you were to read the original letter from Paul, you would have seen larger letters. Scholars have speculated maybe it was the thorn in his flesh. Maybe it had something to do with his eyesight or maybe it had something to do with his hand-eye coordination. We don't know. But Paul is saying that he's writing this last portion himself. Paul wants the Galatians to feel, to see with their own hand, their own eyes, his handwriting and to know that this isn't a minor dispute. This isn't some secondary or tertiary church, you know, theology issue that we can brush under the rug.

This is a gospel crisis and they must respond. It has to do with adding anything to the finished work of Jesus on the cross. And here's why people add to Jesus. Not because they're wicked always. But it's oftentimes because they're scared. And that's what Galatians 6:12 says, "It is those who want to make a good showing in the flesh who would force you to be circumcised and only in order that they might not be persecuted for the cross of Christ."

The circumcision party wanted men who weren't Jewish, who weren't born Jewish by birth, to be marked by the old covenant sign. This sign, circumcision, was to hold Israel, to hold God's covenant people until the Savior came. Why would they want this? Maybe it was because they believed that God would not accept them, accept these new Christians, unless they held to everything in the Old Testament. Maybe it was a love for traditions; they loved the Jewish culture. They loved some of these things that were emblematic of the Jewish faith and they felt like they were losing them as new Gentiles came into the faith. But one reason, certainly, and what Paul says is that they were afraid of persecution, specifically Jewish persecution.

These Christian Jews who came to saving faith in Christ, were probably influenced by friends and family. These relationships that had been ongoing that these friends, these people in their family, maybe neighbors, having conversations with these new Jewish Christians. I bet you they were called unclean; being associated with Gentiles, outsiders, people that they weren't supposed to eat with, Jewish people weren't supposed to eat with. And I bet that these conversations weren't some thoughtful theological conversation. It wasn't some debate between Christian pastors and Jewish rabbis. I'm certain that this was everyday conversations between everyday type of people.

People, Jewish people, not Jewish Christians, but Jewish people who weren't certain. They were already kind of afraid of this new Jesus thing. But now that they hear about these Jewish Christians mixing with these Gentiles who weren't forced to follow all of the Jewish laws, I bet you these people were kicked out of their families or kicked out of these social circles that they were once in. I'll bet you Jewish people would say, "You know, I can't believe that you would do this." Maybe, maybe if you ask them to become Jewish and, you know, celebrate all of the purity laws and become fully Jewish, maybe then you, who are a Jewish Christian, could come back in and be accepted; that it would be okay.

Paul isn't trying to slander anyone. But this decision on what to believe should not be based on social pressures. It should not be based on these external things, these relationships that even we have in our life. The flesh does not just want to be good. It wants to prove. It wants to be seen as good. Legalism isn't just trying hard. It is trying to get a verdict without the cross.

It is trying to get external validation to see people say, "Yes, you are good." People-pleasing isn't just wearing religious clothing. It is when you make faith a badge. You turn sinners into trophies. And that's what Paul continues on in Galatians 6:13. "For even those who are circumcised do not themselves keep the law, but they desire to have you circumcised that they may boast in your flesh."

Boasting in the flesh here means this: it's the equivalent of what happens when Christians celebrate over conversion. When we see a sinner come to saving faith, we rejoice. But these people, these Judaizers, these Jewish Christians, would not celebrate over someone becoming a Christian. They would celebrate when someone would become a Jew. They do this not because they actually want more obedience to the law. The sad part about this is that they fear the persecution. They just want to avoid persecution.

And Paul says this because we cannot have confidence in what we bring to the table. We can't— Paul's telling them that they can't say, "God, I know that you've saved me but I'm more faithful than those other guys who don't get circumcised." And maybe we don't struggle with this today; we don't struggle with circumcision today. We've kind of handled that issue. We know what we believe on this today because Paul has given us something. And yet, we struggle with other things like the idea of baptism or being rebaptized. So many people today believe, well, I need to be rebaptized again as an adult because I didn't make the decision as a kid. I've heard this over and over as a pastor. My question to them is, do you think that you had a choice? If you feel like you don't have a choice in baptism, in being baptized, do you feel like you had a choice in being saved? Did God choose you or did you choose God? No, God chose you even in your infancy. Our baptism is a sign and seal of the covenant, just like circumcision was for the Old Testament. And the beautiful part of our covenantal theology, our covenantal baptism as people who baptize infants, is that it doesn't have to be us saying we made this decision. We get to live into this reality that God chose us even while we were sinners. Our confidence cannot be in ourselves, cannot be even in our own decisions, but they must be in Christ Jesus.

And Paul doesn't just criticize their boast, he shows you what his is. He puts it on the table as the only safe metric for the thing we can boast in. That's what we see in the second section, true boasting declared, confidence in the cross, Galatians 6:14.

True Boasting Declared: Confidence in the Cross (Galatians 6:14-18)

As people, we so desperately want credit. We want to feel like we did something, especially when it comes to our faith. We want to feel like we didn't leave Jesus alone on the cross. We want to believe that if we would have been in the crowd, we wouldn't have shouted, "Persecute him," or, "Crucify him." We wouldn't have been, if we were a disciple, we wouldn't have scattered when Jesus was crucified.

If we would have been Peter, we would have never denied him. And this comes from pride. But the reality is we are sinful. We don't have hope. We would have exactly done the same things as everyone else.

This pride that we have that makes us believe that we would have been different is a faulty one. It leads us to want to add to our salvation. To try to prove to Jesus that we really mean it; that we are truly his.

But we owe a debt. The Bible says that we owe a debt. And if you've ever been in debt, you know what that feels like, especially if it's been significant. If you've ever found out that all of a sudden you're in some serious financial hardship, some serious hole financially. The dread that comes from that is overwhelming. It can cause you to lose sleep. It can cause you to become depressed. It can cause a litany of emotions. But there is no greater feeling than discovering that you've missed something; discovering that there is hope or finding out that there might be someone who can rescue you from this financial hard spot. And the same is true with our faith.

It is never fun to admit that we are in such a spiritual or financial debt that we can't get out of it ourselves. It's humiliating, in fact. And yet, that feeling is dwarfed when we realize the freedom, the relief that comes from being rescued. Paul says this in Galatians 6:14, he says, "Far be it from me to boast except in the cross of our Lord Jesus Christ." When the cross becomes your boast, the world's scoreboard dies. You stop needing old trophies.

Why would Paul say this? That our only boast is in Christ? Why would he have to say this? Because boasting in the cross in the first century, in the first century world, would have been a crazy thing to do. It would have been so, so weird. The cross was a torture method. It was a way to crucify, to kill criminals. It was shameful and everyone saw it that way. Every other person who had been crucified had been guilty in some right. You look at the people who were on the cross, who would be crucified, they were criminals, thieves, murderers. They were bad guys.

Yet, for Paul, this wasn't shameful. It was the only reason for his boast. We cannot boast in anything. As people who are Reformed, who believe that God is sovereign over everything, even our own salvation, we can't boast in anything other than the cross.

I won't be able to get to heaven someday and look at fellow Christians and say, "Well, you know, I came to saving faith when I was 15 and you waited until you were 18. Therefore, I chose Jesus a little bit sooner than you did and therefore I get a chance to boast." No, no, no, no, no. That's how people fall. That's how people become corrupt, being overconfident and not watchful. Because God is sovereign over everything. He chose the time, the exact right time for me to follow him. He chose the exact right time for my wife who was 18 to follow him. There will be no boasting for either of us.

What is my only boast? Or what is my only comfort? That I with body and soul, both in life and in death, am not my own but belong to my faithful Savior Jesus Christ. My only boast is in Jesus. My only comfort is in Jesus. My only hope is in Jesus. Let this be our prayer, Prosper. Let this be your prayer. Far be it from us to have anything pull us into confidence apart from Jesus.

Life with God comes by faith in Christ, not by the law. And that's been our whole theme throughout this series in Galatians. Life with God comes by faith in Christ, not by the law. Far be it from anything to pull us into confidence other than the cross of Christ.

Paul continues on in Galatians 6:14. He says, "By which the world has been crucified to me and I to it." Paul is saying, "I have a new allegiance." And that alludes back to Galatians 1:4. It says this, "He who gave himself," Jesus, "who gave himself for our sins to deliver us from the present evil age." That present evil age is the same idea that Paul's talking about that the world has been put to death. There is this age, this era, that is no longer. We are now under the reign and rule of Christ.

Paul continues on, "For neither circumcision counts for anything, nor uncircumcision, but a new creation." The cross is the only place that pride and shame die together. The world says, "Prove yourself." The cross says it has been proven for you. The cross does not just forgive you, it frees you from needing credit. New creation means this: you don't need old markers to feel clean. You don't need old metrics to feel sure.

Scars, for Christ, are not evidence that God has abandoned you. They are evidence that you belong to Jesus in a world that doesn't. And that new creation does not just change what you believe, it changes what you are willing to bear. It changes what will mark you. The only marker that counts is being sealed by the promised Holy Spirit.

In fact, Paul continues in Galatians 6:17, "From now on, let no one cause me trouble, for I bear on my body the marks of Jesus." Paul is saying if you want a physical mark, if you want to mark your body physically, I'll show you one. Look at my scars. I am branded with the sufferings of Jesus. All of Galatians has been leading up to this point, has been leading up to this final paragraph, this final all-encompassing paragraph. Paul has been pleading with the churches that they cannot add anything to the gospel.

They cannot require circumcision. They cannot require anything that would replace Jesus. Jesus. All, any of these things are things that people can do. All of these things that people could have pride in and use to rank themselves against other Christians, against other believers. If the way that we are saved is by any work of our own, then we have some reason to boast. I could have done more. I could be enough.

For God to save me. You could get into heaven and say, "Yeah, we're all here in heaven, but, you know, I was the one who never missed church in 30 years," or, "I was the one who gave more than anyone else," or, you know, "I really, you know, I accepted Christ before you. You had waited until you're in your 20s, 30s, or whenever you did." No, that is not what we get to boast in. And this is our main idea. Paul says, "Boast only in the cross." That's our main idea. Boast only in the cross.

Main Idea

Boast only in the cross

The gospel is not just how we start as Christians. It is a daily necessity. We are all sinful people, even after accepting Christ, even after being marked by the promise of the Holy Spirit. We need the gospel daily. We never graduate from the gospel.

If you get tired of hearing messages or songs about the gospel, about the saving grace that comes from the gospel, then you don't understand the gospel.

We are not saved by what we've done. We're saved and held to Christ by the cross. If we are saved by what Christ did for us, on our behalf while we were sinners, then what right do we have to claim that we are better than it or better or worse than any other Christian? How can I make rules for entrance into the kingdom if someone else has paid the price for me to get in? I can't. I get in. I get into the kingdom. I get in because he said so. He's the one who took my place. The cross is the only hope for every and any sinner.

Application

Stop letting the fear of people edit the gospel — Galatians 6:12

So what does boasting in the cross look like for us tomorrow? It looks like refusing people pleasing and it looks like reinterpreting our suffering. So let's look at our first point of application; it's this: Stop letting the fear of people edit the gospel. Just like in Galatians 6:12, Paul's saying that these Judaizers, they don't want you to get circumcised because they want you to be more obedient. They don't follow the law themselves. They want it because they don't want Jewish people to persecute them. They want to be able to be in relationship with their friends and families and neighbors who look down at them.

When you feel the pressure to fit in, with your friends, with your coworkers, with your friends or your families. Ask yourself, "Am I avoiding offense of the cross to keep my approval?" This is the most dangerous way heresy creeps into our life. It's not through false teaching, mostly. It's through those everyday conversations we have with people that we don't really want to offend them. And maybe we know that what they're saying might not be biblical but it's easy for us to go along with them. We like the people that we're talking to. We want to stay in those same kind of relationships and so we subtly change what we believe in order to fit in. This is a dangerous, dangerous thing for us.

And so the challenge for you is this: When you feel yourself going against what Scripture says? Well, stand up for the word. Stand up for what Christ did. Let your boast only be in the cross, not in your relationships with others. Jesus says that he comes not to bring peace but with a sword. He will divide us against the people we love because the world will naturally want to fight against truth. And we need to be people who believe in the Word.

I've been in many conversations like this where people will say, "Well, you know, Paul said this and Jesus said this and they seem like they contradict. They seem like, you know, they don't get along. So we got to go with what Jesus says. We got to be red-letter Christians." And there hasn't been a bigger or maybe more subtle undermining belief system in the church. We are not red-letter Christians. Every word in God's Word, in Scripture, is spoken, is breathed out by God. The words of Paul are just as authoritative as the words of Christ. We have to be people who come back to his word and believe even if it offends the people around us.

Reinterpret your suffering — Galatians 6:17

The second point of application is this: reinterpret your suffering. If you carry hardship, if you're going through a hard season, don't assume this is God punishing you. Sometimes the marks of Jesus are what faithfulness costs in a world that resists the cross of Christ.

There are going to be times in your life where you're going through a trial, where you're going through hardship, but that doesn't necessarily mean that God is disappointed in you or something's wrong. Sometimes when we fix our eyes on the cross and we see the narrow road, the narrow path that lies before us that's marked with suffering, we have to choose it. We have to choose to walk through hardship knowing that the joy that is set before us in the cross of Christ is more beautiful, is more satisfying, than anything else. If your treasure, if your boast is only in Jesus, then the trials and sufferings along the way will be nothing, will be light, will be an easy affliction.

Oftentimes, those trials are there as a filter to weed out people who are lukewarm in their faith. So persevere. Do not run away. Paul calls these marks the marks of Christ. The things that can refine us into the Christians, into the people that God is calling us to be.

Why is it that we can boast only in the cross? Why is it that we can boast even in our suffering? It's because Jesus became a curse. He wasn't a boast; he wasn't something that people bragged about when he was hanging on the tree. In Matthew and in Mark, it says that we aren't supposed to look past people; it says that we're not supposed to call out, "Raca," against people. It was this word that meant You nobody.

And as Jesus was hanging on the tree, that was what he was called. He was not a boast. He was not something that people had confidence in. He was something that people said, you no one. He took our place. We were supposed to be called no ones. We were the people who God was supposed to look at and say, depart from me, I never knew you. You are no one. Yet that's what Jesus heard while he was crucified. Jesus took our place. Jesus was treated like us so we could be treated like him. Therefore, we can boast only in the cross.

Closing Prayer

As you're sitting there at home, let's pray together knowing that we are bound more than just by being gathered together, but we can gather together in the spirit this morning as the weather prevents us from meeting in person. Let's pray. Father God, we thank you for who you are. We praise you for this series that, that taught us that life in you comes only through the cross of Christ, not in our works. God, thank you that we are able to have faith in you and that it is separated from works; that we do not need to earn our way to have a right relationship with you but you have made it possible by sending your Son. God, I pray that if there is anyone who does not believe this, that they would come to this saving faith. God, that they would believe this gospel because it transforms every single part of who we are. God, whether we've heard this for the first time today and are accepting Christ or we've believed our entire life, let us be transformed not by my words but by the words that you've given us in this letter. God, your gospel, your good news, is so satisfying. God, let our only boast be you. Be the cross of Christ. A thing that should be a shameful thing, but God, it is the most glorious reality in all of human history, all of the world, all of eternity. God, let us bear these marks. Let us boast in you alone. God, we love you and we love to do your will. So help us do that today. It's in your name we pray. Amen.

Hear this blessing, this departing blessing that comes right from the end of this book. The grace of our Lord Jesus Christ be with your spirit, brothers and sisters. Amen.

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