Matthew 28:18 to 28:20; 2 Corinthians 13:14 There is only one true God who exists eternally as three distinct, co-equal, and co-eternal persons: the Father, the Son, and the Holy Spirit. Define the historic Christian doctrine of the Trinity with biblical precision. Trace the biblical evidence demonstrating the full deity of the Father, the Son, and the Holy Spirit. Guard against common historical distortions like Modalism and Arianism. Polytheists worship many gods; secularists worship no gods; unitarians worship a single solitary entity. Historic Christianity uniquely confesses the Triune God: an eternal communion of holy love. The Great Commission and the Singular Name In Matthew 28:19, the risen Jesus commanded his apostles: "Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit." Notice the grammar: Jesus does not say "in the names" (plural), but "in the name" (singular). There is one divine essence, one holy name, yet revealed in three distinct persons. The doctrine of the Trinity is not a post-biblical invention, but the unavoidable confession of the entire New Testament. Three Biblical Truths That Define the Trinity The doctrine of the Trinity can be summarized in three foundational biblical affirmations: 1. There is only one God (Deuteronomy 6:4, Isaiah 45:5). 2. The Father is God, the Son is God, and the Holy Spirit is God (John 1:1, Acts 5:3 to 4, Philippians 2:6). 3. The Father, Son, and Spirit are distinct persons (at Jesus' baptism in Matthew 3, the Son is in the water, the Spirit descends like a dove, and the Father speaks from heaven). They are not three separate gods (tritheism), nor is God one person wearing three masks (modalism). Why the Trinity Matters for Discipleship 1 John 4:8 states that "God is love." If God were a solitary, isolated individual before creating the universe, whom could he love? Solitary deities require creation in order to experience relationship or express love. But the Christian God has been an eternal community of selfless, mutual love among Father, Son, and Spirit for all eternity. We were created not out of divine loneliness, but out of an overflow of divine joy, invited to share in the relational life of the Trinity. The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all. 2 Corinthians 13:14 What is notable about the grammar of Matthew 28:19 when Jesus commands baptism? It uses "in the name" (singular) for Father, Son, and Holy Spirit It lists seven different names of God It mentions angels alongside the Father It commands baptism in Latin It uses "in the name" (singular) for Father, Son, and Holy Spirit The singular "name" underscores the one divine essence shared by all three persons. What error teaches that God is one person who simply changes masks or modes of operation? Modalism Trinitarianism Atheism Deism Modalism Modalism falsely claims Father, Son, and Spirit are temporary roles rather than eternal distinct persons. Why does the truth that "God is love" require the Trinity? Because eternal love requires a beloved, which exists among Father, Son, and Spirit from all eternity Because love is an ancient Greek word Because humans taught God how to love Because angels asked for love Because eternal love requires a beloved, which exists among Father, Son, and Spirit from all eternity God did not need creation to experience love; eternal love has always flowed within the Trinity. When you pray this week, intentionally address each person of the Trinity: pray to the Father, through the Son, in the power of the Holy Spirit. Triune God, Father, Son, and Holy Spirit, you dwell in eternal glory and perfect love. Thank you, Father, for choosing us; thank you, Lord Jesus, for redeeming us by your blood; thank you, Holy Spirit, for sealing us and guiding us into all truth. Draw us deeper into your divine fellowship today. In Jesus' name, Amen. Why are common analogies for the Trinity (like water, ice, steam, or an egg with shell, white, yolk) ultimately flawed or misleading? How does knowing that God is an eternal community of love shape how we love others in our youth group and church? Youth grasp the essential biblical architecture of the Trinity, avoiding modalism and tritheism while reveling in God's eternal love. Ask students if they can explain how God can be love before creating anything. Introduce the eternal fellowship of Father, Son, and Holy Spirit! Is the word "Trinity" found in the Bible? No, the word "Trinity" was coined by early theologians like Tertullian to summarize the overwhelming biblical data that Father, Son, and Spirit are the one God. 5 min Hook, 20 min Trinitarian Exegesis, 10 min Memory Verse Drill, 10 min Discussion, 5 min Prayer