06/01/2026
Holy Trinity Sunday
Text: 2 Corinthians 3:11-14
Theme: Trinity, by Necessity
11 Finally, brothers and sisters, rejoice! Strive for full restoration, encourage one another, be of one mind, live in peace. And the God of love and peace will be with you. 12 Greet one another with a holy kiss. 13 All God’s people here send their greetings. 14 May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all.
TRINITY, BY NECESSITY
From The Book of Concord: The Apology of the Augsburg Confession: Article I: This asserts our faith and teaching that there is one undivided divine essence, and that there are nevertheless, three distinct and coeternal persons of the same divine essence, Father, Son, and Holy Spirit. We have always taught and defended this doctrine and we believe that the Holy Scriptures testify to it firmly, surely, and irrefutably. These are the words of our spiritual forefathers, and I pray they are all words you stand by. I certainly do. I wouldn’t—I couldn’t—be your pastor if I didn’t. When I was first ordained, I was asked if I believed that the Apology of the Augsburg Confession was “a true exposition of the Word of God” and “in agreement with this one scriptural faith.” I said yes. Lord willing, a few short months from now, some 40 new pastors entering the ministry field will say yes, too. You cannot be a Christian pastor if you consider what the Augsburg Confession says about the Holy Trinity to be negotiable. But how is it for Christians in general? The Apology of the Augsburg Confession continues: We steadfastly maintain that those who believe otherwise do not belong to the church of Christ but are idolaters and blasphemers. To reject the Trinity is to make one an idolater, one who worships a false god. To deny Father, Son, and Holy Spirit is to be a blasphemer, to treat God with the utmost contempt. If the words of the Apology of the Augsburg Confession weren’t enough for you, consider the words of the Athanasian Creed, a profession of faith we consider just as valid and true as the Apostles’ and Nicene Creeds: Whoever wishes to be saved must, above all else, hold to the true Christian faith. Whoever does not keep this faith pure in all points will certainly perish forever. Now this is the true Christian faith. The Creed then proceeds to speak of the Holy Trinity as well as the human and divine natures of Christ Jesus before concluding with: This is the true Christian faith. Whoever does not faithfully and firmly believe this cannot be saved.
These are strong words. In fact, I daresay these are the strongest possible words that could be said on the subject! But why are they so strong? What gives these statements of faith such authority, that we should take what they say about the Trinity so seriously? We know not to reject what it says in the Bible, because those are the actual words of God, who divinely inspired mortal men to pen his message to the world. These, however, the Augsburg Confession, the Creeds, and the like, they’re not in the Bible. They can’t claim divine authority the way books like Ezekiel, Jonah, and Esther can, can they? But that’s the thing, they are only authoritative because they are accurate summaries of the teachings of the books of the Bible. So, as you page through the Scriptures, reading everything you can about the Father, Son, and Holy Spirit, you will find that the Athanasian Creed, for example, properly reflects what can be found on that topic throughout the Bible’s 66 books. The doctrine of the Trinity is taught all throughout God’s Word, and with the Athanasian Creed, we have that doctrine faithfully reproduced with care and precision. Practically speaking, then, those who reject the Augsburg Confession and the Creeds reject the teachings of the Bible itself, including what it teaches about the Trinity. So, the grim proclamation that those who reject the Trinity are idolaters and blasphemers who cannot be saved is Biblically-backed. So now we ask another question: Why does the Bible itself take the Trinity so seriously?
On a basic level, the fact that the Trinity is established in Scripture at all should mark it as “important.” As we established last week at Pentecost, the Word of God is how the immortal God chooses to reveal himself to mortal men. Not through dreams. Not through visions. But through all the books Genesis through Revelation. Who are we, that God should let us know anything about him? And yet what a treasure trove we have of information on the Almighty! We know that God is righteous yet merciful, just yet compassionate. We know that he loathes sin and demands righteousness, but we also know that he made us righteous and rid us of our sin. We know that he created us, we know that he loves us, we know that he provides for us. We also know that he is Triune, and just like any other piece of knowledge we gain about God from Scripture, we treat this biblical fact as the treasure it is. To deny any portion of Scripture, Trinity or otherwise, is to deny God himself, to claim there are parts of him we don’t care to know, that the blessing of intimacy with our Creator is simply something we aren’t interested in. To deny Scripture is to distance oneself from God, and to distance oneself from God is to invite damnation!
For the doctrine of the Trinity, however, there is another factor at play. The Trinity is one of the key doctrines of the entire Bible. All of God’s Word points to the work Jesus did for our salvation. That is the absolute core of Scripture, and the Trinity is inseparably tied to that core. Who is Jesus? He is the perfect Mediator between God and man, because he is both God and man. Jesus, the Son of God the Father, entered into humanity by being born of the virgin Mary. But, like Mary, we ask, “How can this be, since (she) is a virgin?” To this, the Angel Gabriel answered, “The Holy Spirit will come on you, and the power of the Most High will overshadow you. So the holy one to be born will be called the Son of God.” (Luke 1:35) The Most High is God the Father, Mary’s child is God the Son, and this child was conceived not by mortal man, but by God the Holy Spirit. All three members of the Trinity are involved in Gabriel’s glorious proclamation to Mary, but what’s the end result of this? It’s what we said before: that Mary’s child, Jesus, is both God and man. Man, so that he could be a proper substitute for all mankind, and God, so that the precious blood he shed would be sufficient payment for every sin of every person for all time. Our salvation depends on Jesus being both God and man, but you cannot have the doctrine of Jesus’ two natures without also having the doctrine of the Trinity.
What’s more, as Jesus ascended into heaven, he commanded his disciples to make more disciples, not only by teaching them the Word of God (which would include the doctrine of the Trinity) but by baptizing them “in the name of the Father, and of the Son, and of the Holy Spirit.” Baptism and the Trinity go hand-in-hand as well. It was at Jesus’ very baptism that humanity would receive just a glimpse of all three members of the Trinity at the same time: God the Son, being baptized by John in the Jordan River, God the Father, voicing his approval from heaven, and God the Holy Spirit, descending like a dove. Now, in our baptisms, we follow Jesus’ command to apply water in the name of the Triune God. It is only when a baptism is carried out in the name of the Father, Son, and Holy Spirit that it is considered valid. If a baptism were to take place outside the name of the Triune God, it wouldn’t be considered a baptism at all! The whole process would be null and void, because in a proper baptism, the Holy Spirit brings new life and saving faith into our hearts—faith not in the work of sinful man, but in the work of the God-man, Jesus. And in this new, Holy Spirit-given life, we are reconciled to God the Father. We are dead to sin, but alive in God! So once again, without the Trinity, there is no baptism, there is no saving faith, and there is no new life with God. What a joyful truth it is, then, that we are not without the Trinity!
Our God is a Triune God. With our finite human understanding, we cannot fully comprehend how this can be. Even so, we accept it as true, as the Holy Spirit enables us to do. But if we were to compromise on this doctrine, because it doesn’t make sense to us, because we insist on rationalizing it, because it seems too confusing to learn, we would not be worshipping the One True God. We’d be idolaters, worshipping a god whose mechanics we can perhaps understand just a little bit better, but not the God who reveals himself in Scripture. Yes, we do proclaim that churches and individuals who deny the Trinity are unchristian, and we proclaim this without flinching and without hesitation. Christ as our mediator, our faith, our salvation, our baptism, it’s clear that a church can’t be considered Christian without these. I pray that, now, this point is just as clear when it comes to the Trinity. This is the true Christian faith. Whoever does not faithfully and firmly believe this cannot be saved. But you do believe and you are saved. And while you still may not fully understand all the ins and outs of the Holy Trinity, you’re in good company! No one fully “gets” it, but we can all surely cherish it. That is my prayer for you, that you continue to see and treat this divine mystery as the treasure it is. Praise the God from whom this, and all other blessings flow! Praise Father, Son, and Holy Ghost! Amen!