Triune Forgiveness – Sermon on Isaiah 6:1-7 for Holy Trinity Sunday

Isaiah 6:1-7

1 In the year that King Uzziah died I saw the Lord sitting upon a throne, high and lifted up; and the train of his robe filled the temple. 2 Above him stood the seraphim. Each had six wings: with two he covered his face, and with two he covered his feet, and with two he flew. 3 And one called to another and said: 

“Holy, holy, holy is the Lord of hosts; 
the whole earth is full of his glory!” 

4 And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke. 5 And I said: “Woe is me! For I am lost; for I am a man of unclean lips, and I dwell in the midst of a people of unclean lips; for my eyes have seen the King, the Lord of hosts!” 

6 Then one of the seraphim flew to me, having in his hand a burning coal that he had taken with tongs from the altar. 7 And he touched my mouth and said: “Behold, this has touched your lips; your guilt is taken away, and your sin atoned for.”

In the name of Jesus. Amen.

Today, I have five observations to consider from this text.

1. What Isaiah sees is remarkable but not unique. Isaiah had this vision of God when he was in the Temple. But it’s important to note that Isaiah was not the high priest, so this vision didn’t take place while Isaiah was in the Most Holy Place. Isaiah wasn’t even a priest, so this vision couldn’t have been when Isaiah was in the Holy Place either. Isaiah was a prophet called by God, but he was normal guy. In other words, Isaiah would have been in the courtyard of the Temple with all the other regular worshippers. You can basically think of this vision as what Isaiah sees when he goes to Church. He’s normal guy in a normal place at a normal time, but what he sees is extraordinary. 

Dear saints, there are things going on around us right now that we cannot see or hear. But just because our senses don’t pick them up doesn’t mean they are any less real than the things we can perceive with our senses. The Bible teaches that there are angels all around us all the time protecting us and ministering to us. Jesus Himself teaches us that He is present with us and seated on His throne with all authority in heaven and earth (Mt. 28:18, 20; 18:20). And that is always true whether you are at church or not. 

But when you are in church, the same things Isaiah saw in this vision are here and present with you. Hebrews 12:22-24 says, “You have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, and to innumerable angels in festal gathering, and to the assembly of the firstborn who are enrolled in heaven, and to God, the judge of all, and to the spirits of the righteous made perfect, and to Jesus, the mediator of a new covenant.” In other words, here in this sanctuary you are in God’s domain. The angels and archangels, the seraphim and cherubim are all here. Surrounding you are all God’s people, Christians from every time and age, present here worshipping, glorifying, and praising God with you. You can’t see them, but that doesn’t make their presence any less real.

What Isaiah sees here is always true when God’s people gather together. In other words, it isn’t as though God was normally far, far away, but then, one time, He came close enough for Isaiah to see Him. No Isaiah simply is allowed to see the reality of God’s presence which was and is normally invisible. Dear saints, when you come into this place, see with your ears. The triune God – Father, Son, and Holy Spirit – along with all the angels and all the saints of all time are present right here with us.

2. Notice this reality that Isaiah sees. Isaiah sees the Lord sitting upon a throne. And Scripture leaves us no doubt. Isaiah sees Jesus. The Gospel of John spells it out. Isaiah sees Jesus, the eternal Son of God and the second Person of the Trinity (Jn. 12:36-41). Above Jesus, Isaiah sees the seraphim. These are one of the types of angels that Scripture tells us about. Their name means ‘burning ones.’ These angels have six wings. Two of the wings are used to cover the seraph’s face; two cover the seraph’s feet; and two are used to fly. Now, the interesting thing is that these seraphim are already holy. The don’t have any sin, but even they need to cover their creatureliness before the awesome holiness of God.

That brings us to their song. The seraphs sing, “Holy, holy, holy is the Lord of armies; the whole earth is full of His glory.” Their song is repetitive, three holy’s. It is true that the Hebrew language will use repetition for emphasis. God is holy, holy, holy. But those three holies could also be translated as, “Holy One, Holy One, Holy One.” Three holy Ones – again, Father, Son, and Holy Spirit. The angels are praising one God, but three distinct holy Ones. Now, Isaiah can only see the Son, but he hears the praise of each Person of the Trinity. And we know that all three persons of the Trinity are there because just after our text, the triune God asks, “Whom shall I [sg.] send, and who will go for Us [pl.]?”

3. Look at Isaiah’s response. Standing in the presence of the holy Trinity, Isaiah is terrified. Isaiah says, “Woe is me! For I am lost; for I am a man of unclean lips, and I dwell in the midst of a people of unclean lips.” We need to dissect this a little bit. Notice that Isaiah starts with a conclusion before moving to his confession. Isaiah’s conclusion is, “Woe is me! For I am lost.” That’s his understanding of the situation and what he thinks is going to happen to him. But his conclusion is wrong. It’s wrong not only because that isn’t what happens, but it’s also wrong because it is a denial of who God is.

When Isaiah says, “I am lost,” thinks he is about to be cut off and damned. He figures God has finally come to judge him and condemn him to hell. This is wrong and, frankly, disappointing. Remember Isaiah was in the Temple. The Scriptures clearly teach that the whole purpose of the Temple, the reason it was there, was so God could dwell among His people and forgive their sins (2 Chr. 6:21, 27). God had defined Himself as the God who is merciful and gracious slow to anger and abounding in steadfast love and faithfulness… forgiving iniquity and transgression and sin (Ex. 34:6-7).

Imagine coming to church. You hear the absolution. In the sermon, you are pointed to Jesus as the Lamb of God who takes away your sin. You receive the Body and Blood of Jesus for the forgiveness of your sins. Then, you have a vision like Isaiah’s and your response is, “Well, I’m going to hell.” That’s ludicrous, but that’s Isaiah’s conclusion here! Dear saints, the whole point of everything we do here at church is to remove any doubt and increase your faith that God has forgiven all of your sins – every last one of them – for the sake of Jesus’ death and resurrection. As disappointing as Isaiah’s conclusion is, we would probably do the same. Repent. God isn’t lying to you when He delivers His grace and mercy to you here in this place. You are forgiven, made holy, continually given the perfect righteousness of Christ. Amen?

Now, Isaiah’s confession and recognition is right. He is a sinner. He does have unclean lips, and the people around him have unclean lips. This means he deserves God’s wrath and judgment, but His conclusion is still false.

4. Isaiah’s guilt has a location. Sin isn’t just floating around as some nebulous, philosophical idea. No. Isaiah recognizes his sinful lips. But didn’t Isaiah have sinful feet? What about corrupt eyes? A lustful groin? An idolatrous heart? So, why does Isaiah focus on his lips?

The best guess is that the devil somehow knew God was about to call Isaiah to be a prophet. To be a prophet requires the use of your lips and mouth to speak the Word of God. So, Satan probably made extra effort that day to point Isaiah to how he sinfully used his lips to make Isaiah feel guilt and shame with the very instrument God would use Isaiah to minister.

The devil does this all the time. He will point out the sin and iniquity of the very gifts God wants us to use in fulfilling our callings and vocations in service to Him and our neighbor. This is true for all Christians, but today I want to address you fathers since I won’t be here next week.

Fathers, first of all, happy Fathers’ Day a week early. You fathers, the devil will do this to you. Satan will try to point you to your failures as a husband and father. And it will be easy for him to do this because you do fail. Sometimes, you are too harsh; other times you have been too lax in disciplining your children. You don’t show the kindness and love you should, and you have not been the father God intends you to be. But those sins do not disqualify you from being a father to your children. One of the most important things fathers can teach their children is confessing when you sin and asking for forgiveness. Again, your failures do notdisqualify you from being a father. Fathers, if you are still alive and still have children, God calls you to be a father. And God will equip and enable you to be exactly the father that your children need. Which brings us to the fifth and final observation.

5. The glory of the triune God is His forgiveness and mercy. Because there is one God and three Persons – because God is Father, Son, and Holy Spirit – God is both just and merciful, both just and loving. If God were only one, this couldn’t be the case. But because God is Father, Son, and Holy Spirit, God the Son can satisfy God’s just demands, and He has. Jesus has done for you what you could not do for God. Jesus renders His perfect obedience to the Father, and the Holy Spirit delivers to you the peace of forgiveness in Christ as He works on you through the Scriptures. Just don’t think that the Father is the only member of the Trinity who is just, that the Son is the only member who is loving and merciful, and that the Holy Spirit is the only member who works out your salvation. That isn’t the case either.

Dear saints, what God did for Isaiah, He does for you as well. It wasn’t the coal that removed Isaiah’s sin. It was God’s promise. Yes, God attached that promise to the coal which made it the instrument that delivered that promise to Isaiah. But God’s promise is attached to more things than that one coal that burned up millennia ago. God has attached His promise of mercy and forgiveness to the water of your Baptism. When those waters touched your body, your guilt was taken away, and your sin atoned for. When you heard the absolution earlier, those words entered your ear, and your guilt was taken away, and your sin atoned for. When you eat and drink the Body and Blood of Christ, your guilt is taken away and your sin atoned for.

God the Father, Son, and Holy Spirit is here today to bring you His mercy and grace freely given because of Christ. You are clean, and God sends you from here back out into the world with a free, spotless conscience (Heb. 10:19-25). Amen.

The peace of God, which surpasses all understanding, will guard your hearts and minds in Christ Jesus. Amen.

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