Sermon for the Twelfth Sunday after Pentecost

WHEN YOUR BROTHER SINS AGAINST YOU

Grace, mercy and peace to you from God our Father and our Lord Jesus Christ! 
Amen. Jesus says to you and to me in today’s Gospel, 

If your brother sins against you, go and tell him his fault, between you and 
him alone. If he listens to you, you have gained your brother. 

If each of us can somehow manage to listen to Jesus and take these Words to 
heart—if you and I both can stop sidestepping what Jesus tells us here and 
actually do what His Words command us to do—our homes will become much happier 
places; our friendships will become much closer friendships; our congregational 
life will become a much dearer fellowship of believers. The question you need 
to ask and to answer for yourself today is this: Will you listen to Jesus and 
take His Words to heart? Jesus says to you, 

If your brother sins against you, go and tell him his fault, between you and 
him alone. If he listens to you, you have gained your brother. 

Dear Christian friends,

Sin is a terrible power and destructive force in everyday life, both in your 
life and in mine. Sin does more than punish with death and threaten with hell. 
One of the here-and-now, devastating effects of our sin is that it divides and 
separates us here-and-now. Sin isolates and cuts Christians off one from 
another, banishing its victims to lonely exiles of anger and regret. Sin has 
the power to divide and separate us, even while we gather together at the 
family table or sit side-by-side in the Sunday pew, leaving too many things 
unsaid.

In today’s Gospel, Jesus wants you to know that things do not need to be that 
way for you, for your family, or for your congregation gathered here. (Yes, for 
all of our congregational peace and harmony, sin nevertheless continually 
operates as a divisive force among us.) Jesus wants you to know that, rather 
than being separated and driven apart by sin, you and I now have divine 
power—power to use even sin to our collective advantage. Call it the power of 
forgiveness; call it a clear perspective on what is truly real and important; 
call it a memory that has been washed clean of resentment, anger and pain in 
the daily flow of your Baptism: Jesus wants you Christians—that is, you 
brothers, as He calls you in today’s Gospel—Jesus wants you brothers to know 
that you now have the power to make sin something that gathers, rather than 
separates. Because of Jesus and His great, forgiving love for us, our 
ever-present sin can now draw me closer to you,
 you closer to me, and us closer to those around us. Jesus speaks this power to 
you in today’s Gospel when He says to you, “If your brother sins against you, 
go and tell him his fault, between you and him alone. If he listens to you, you 
have gained your brother.”

JESUS IS SPEAKING PERSONALLY TO YOU, NOT SOMEONE ELSE

As you listen to these Words of Jesus, you could easily fool yourself into 
thinking that these Words are actually more applicable to other people, and not 
so much to you. When you think that way, you sin. For example,

·       You could say that other peoples’ sins are not your concern; as long as 
they leave you alone, you do not care what they do. By all means, we must bear 
with the weaknesses of the weak, we must be slow to judge and quick to place 
the best construction on the actions of others. But forbearance should not be 
confused with ignoring or neglecting your brother, and your brother’s public 
and unrepentant sin most certainly involves you. You are all the body of Christ 
together, each accountable to one another. No, you cannot live someone else’s 
life for him or make other peoples’ decisions for them. Nevertheless, when your 
Christian brother falls public, unrepentant sin, he is doing damage to you and 
to your reputation: the unbelieving world will draw its conclusions about 
you—and about the entire Church—based on the unrepentant actions of one brother 
in your midst. 

·        “No, I am too old or too young to get involved. I also do not want to 
ruin my friendship with this person. Showing my brother his sin needs to be 
someone else’s job.” If I should respond to Jesus’ Words in that way, saying 
that I do not want to get involved, then I am not much different from the 
person who walks down the street and ignores the woman or child who is getting 
attacked in broad daylight. Each of us is only able to love according to our 
individual abilities, of course, but no one gets exempted from the command to 
love! When you say to yourself that it is someone else’s task to “go and tell 
[your brother] his fault,” you are really saying that is someone else’s task to 
love your neighbor and not your own.

·       You might say to yourself, “My brother’s sin really is no big deal. 
These days, everyone lives like that. It is not like he has killed somebody.” 
Ask yourself: do you really want to tell Jesus that sin is no big deal? That 
would be like saying your Lord’s death and resurrection are no big deal, since 
Jesus died for sin—yours and mine and your brother’s. Jesus sounds pretty 
emphatic about the seriousness of sin when He says in today’s Gospel, 

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.

·       “I myself am guilty of many sins!” you say. “What business do I have, 
pointing out to my brother the sins he has?” Yes, you have many sins. Go ahead 
and admit them when your brother shows you your fault. The point of calling one 
another to account is not so that we can keep tabs on who lives the holier 
life. Jesus is not commanding us to be morality police, or to run around with 
flashlights at night, spying into peoples’ kitchen window. The point of showing 
your brother his fault is repentance and faith, reconciliation and fellowship, 
forgiveness of sins and eternal life. The point of showing your brother his 
fault is love for your brother. That is why Jesus says to you here, “If he 
listens to you, you will have gained your brother.”

“If your brother sins against you,” says Jesus, “go and tell him his fault, 
between you and him alone.” You could easily sidestep these Words of Jesus. You 
could emphatically convince yourself, that these Words of Jesus apply more to 
other people than they do to you. If you do, you will only be compounding the 
devastating, separating effects of sin in your everyday life and in the lives 
of those around you.

·       When your brother sins against you—whether you are bothered by his son 
or not—when your brother sins against you, he has begun the age-old process of 
isolating himself from you and cutting you off from him.

·       When your brother sins against you, and you REFUSE “to go and tell him 
his fault,” you further, perhaps even permanently complete, the separation and 
isolation. You add your sin to his sin by your sinful silence. 

MANY BENEFITS TO LISTENING TO JESUS!

In today’s Gospel, Jesus wants you to know that things do not need to be that 
way for you, for your family, or for your congregation gathered here. Jesus 
wants you to know that, rather than being separated and driven apart by sin, 
you and I now have divine power—power to use even sin to our collective 
advantage. The benefits you receive from listening to Jesus’ Words—the benefits 
you receive by going and telling your brother his fault—these benefits will 
totally change your life, your view of your brother, and your appreciation for 
God’s living and powerful Word.

·       Jesus says, “Go and tell [your brother] his fault.” Browbeating the guy 
is not the point. The point is to focus your brother’s attention upon the Word 
and Law of his God. When you tell your brother his fault, not only do you open 
to him the powerful Word of God—which Word alone is able to bring about his 
repentance—but you yourself also learn courage by trusting in God’s Word alone. 
Not only does your eloquence lack the power to turn the guy around, but it is 
also a frightening thing to confront another person. God’s Word is trustworthy. 
You will quickly learn to trust God’s Word when you tell your brother his 
fault. Even if your brother refuses to listen to you, you will still have had 
exercise and training in trusting the Word.

·       As you earlier protested, you are indeed guilty of many sins. Rather 
than using your guilt as a way of ignoring Jesus’ Words, use your guilt as a 
way of standing ever closer to your guilty brother, especially when you tell 
him his fault. Approach with your hat in your hand. Plead guilty of every sin, 
just as you do in the Lord’s Prayer. Explain to your brother that you yourself 
are a beggar. Emphasize that by telling him his sin all you are attempting to 
do it so show him his hunger—the hunger you share. But then tell your brother 
also where he may find food: in the forgiveness given by Jesus. Jesus’ 
forgiveness is for you, full and complete and free. Jesus’ forgiveness is so 
great and so all-encompassing that there is more than enough to go around.

·       “If he listens to you, you will have gained your brother.” Both of you 
will have new understanding of what it means to be the body of Christ, one 
joined to the other. You will know better your brother and he will better know 
you. You will better understand your brother and he will better understand you. 
You will better appreciate your brother and he will better appreciate you. You 
will better love your brother and he will better love you. (Some of you already 
know that what I am saying is true because you have been down this road before, 
either with me or with one of your other Christian brothers.) We are not 
individual sinners and individual believers. We are “the holy Christian church, 
the communion of saints.” We have but one Lord, one faith, one baptism 
(Ephesians 4:5). We are one fabric, co-equal in guilt and co-equal in the 
white-clothed holiness Christ Himself has given us in baptism.

·       “If your brother sins against you,” says Jesus, “go and tell him his 
fault, between you and him alone.” This is not an act of judgment in today’s 
Gospel. This is an act of reconciliation. Jesus has given us today’s Gospel 
because Jesus is way more powerful than all of our sin put together. Jesus’ is 
so powerful—His death and His resurrection are so world-changing—that He has 
even changed the direction of sin and its effects. Sin no longer needs to 
divide and separate because Jesus’ blood has changed the tide. Sin now has the 
power of binding us together in understanding and forbearance. Sin now has 
drawing us each closer, both to Jesus and to one another.



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