As Christians, we confess that God is one God in three persons — Father, Son, and Holy Spirit. We do not believe it because a council invented the idea or because it satisfies our philosophical curiosity. We believe it because Scripture teaches it clearly. As the 1689 London Baptist Confession reminds us, everything necessary for God’s glory and our salvation, faith, and life is “either expressly set down or necessarily contained in the Holy Scripture.” The Trinity is the quintessential example as there is no single verse that uses the word, yet Scripture presses the doctrine on us from every direction.
Hebrews 1 shows this with striking clarity. The author quotes Psalm 102:25–27, words originally addressed to Yahweh, the eternal Creator, but in Hebrews 1:8-12 applied directly to Jesus Christ, without argument or apology. The author of Hebrews assumes his readers will simply see it. This single text reveals the Trinity’s three biblical foundations: there is one God (monotheism), the Father and Son are distinct persons who speak to one another, and the Son shares the Father’s full, uncreated eternity (coequal and coeternal).
The doctrine of the Trinity is not abstract. It secures our assurance, because our salvation rests on God’s unchanging nature rather than our own consistency. It deepens our prayer and worship, because we are welcomed into real fellowship with Father, Son, and Spirit. And it fuels obedience that flows from being loved, not obedience that strives to earn love.
Discussion Questions
- What does it mean to be a biblical Trinitarian rather than simply a Trinitarian? Why does that distinction matter?
- Read Hebrews 1:10–12 and Psalm 102:25–27 together. What is significant about how the author of Hebrews applies this psalm to Jesus?
- Which of the three foundations (monotheism, three persons, coequal and coeternal) is hardest for you to hold together with the other two? Why?
- How would you respond to someone who asks, “Do I need to understand the Trinity to be saved?”
- In what specific area of your life this week could you lean more on the truth that God does not change?
- How might believing that God has always been love (before creation) change the way you approach prayer or worship?
Further Study:
The Forgotten Trinity, James White
Delighting in the Trinity, Michael Reeves
Communion with the Triune God, John Owen
Bonus Video: St. Patrick’s Bad Analogies – Lutheran Satire