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Trinity, Triunity, Triune God – What Is It?

In short, what I explain in detail below:

📘 Doctrine of the Trinity – Simply Explained

• God is one being in three persons: Father, Son (Jesus), and Holy Spirit – all are of the same essence, but distinguishable in their roles, and act in perfect harmony with one another.
• This doctrine is not explicitly stated in the Bible in these words, but is implied by Scripture: e.g., in the Great Commission (Matthew 28:19), “I and the Father are one” (John 10:30), and the work of the Holy Spirit (John 14:26).

🧩 What Is This About?

Christianity is a monotheistic faith, meaning Christians believe in one God. This makes it difficult to explain that Christians believe in a God who reveals Himself as Father, Son, and Holy Spirit. Catholics, Orthodox, Anglicans, and Evangelicals agree on this. The doctrine is hard to understand. Jehovah’s Witnesses even reject it, despite calling themselves Christians. They claim the churches invented it. I will show you that this is not true. The doctrine of the Trinity is found throughout the Bible.

I would prefer if we didn’t speak of the “Trinity,” but rather of the Triunity, because that better expresses what it’s about: a unity in three “persons.”

To present everything correctly, I have taken an article from Thomas Gerlach’s Online Dogmatics and had it translated into simple language by ChatGPT to use this information in my article.

I also address the criticism of Jehovah’s Witnesses and refute it.

Let’s get started:

🧩 What Is the Trinity?

• In Christian doctrine, Trinity (Triunity) means: God is one being, but exists in three persons – Father, Son (Jesus), and Holy Spirit. These three are distinct, but share one and the same divine essence, and always act together.

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Why Is This Topic Important?

• Some say the concept of the Trinity is not literally in the Bible. Indeed, terms like “Trinity,” “hypostasis,” or “homoousios” (of the same essence) are not directly used there. (See: Evangelium21: Is the Trinity Biblical?)
• Nevertheless, the Bible contains all the statements from which this understanding can be logically derived—it is implicitly present in the New Testament, similar to other theological doctrines (e.g., creation or justification).

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What Does the New Testament Say?

• Father, Son, and Holy Spirit are mentioned separately:
  • Example: The Great Commission (Matthew 28:19): “baptizing them in the name of the Father and of the Son and of the Holy Spirit” mentions three “persons” acting together (not “names,” but “name”).
• Jesus and God are one:
  • John 10:30: “I and the Father are one.”
• The Holy Spirit acts independently:
  • John 14:26: The Spirit is described as the “Helper,” whom the Father sends in the name of the Son. He speaks, teaches, and reminds.

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What Is the Short Core Formula?

1. One God – God is a single being.
2. Three Persons – Father, Son, and Spirit are distinct yet God.
3. Equal Divinity – Each of these persons is fully and completely God.

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Why Do We Need the Doctrine of the Trinity?

• It helps to think of God’s unity and tri-unity together without contradiction:
  • God is one (Deuteronomy 6:4),
  • and yet we encounter Him in three persons (two of whom are already mentioned in the Old Testament, and Jesus is added in the New Testament).
  • Without the Trinity, Jesus’ divinity and the role of the Holy Spirit would be difficult to explain.

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Conclusion

The doctrine of the Trinity:

• Is not a direct, technical biblical teaching system, but a logical conclusion from the biblical texts;
• systematically summarizes what the New Testament says about the Father, Son, and Holy Spirit;
• preserves monotheism (belief in one God), while also recognizing the three divine persons.

🚨 Objections from Jehovah’s Witnesses (JW) & Counterarguments

1. Claim: “Trinity Only in the 4th Century”

Jehovah’s Witnesses say the Trinity is a later invention, first introduced at the Council of Nicaea in 325 AD.

Response: While the term “Trinity” was formally developed later, theological indications are already found in the New Testament—e.g., in Paul (2 Corinthians 13:13) and the baptismal formula (Matthew 28:19). Early Christian baptismal formulas and prayers show that the church was already oriented toward the idea of the Trinity.

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2. Claim: “Jesus Is Created and Not Eternal”

They refer to verses like Colossians 1:15 (“firstborn of all creation”) and Revelation 3:14 (“beginning of God’s creation”)—Jesus is therefore a created being.

Response: The term “firstborn” typically refers to rank and honor—not to being the first created. Bible passages like John 1:1 (“the Word was God”) show His full divinity. The apostle Thomas explicitly calls Him “my Lord and my God” (John 20:28), clearly testifying to Jesus’ divinity.

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3. Claim: “John 1:1 Does Not Say ‘the Word Was God’”

The New World Translation of the JW translates the verse: “the Word was a god,” which fits their hierarchy doctrine.

Response: The majority of translations and grammatical analysis of the Greek original argue otherwise: the word is grammatically without an indefinite article (“theos”) and can thus be translated as “God,” not “a god.” Biblical statements like Colossians 1:15–20 also make Jesus fully divine as Creator and Son.

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4. Claim: “1 John 5:7 Is Missing – Comma Johanneum”

This verse, which explicitly names the three witnesses in heaven, is not included in modern manuscripts.

Response: Although this passage is missing in early manuscripts, the doctrine of the Trinity does not depend solely on it. Rather, it is supported by numerous other Bible passages (e.g., Matthew 28:19; 2 Corinthians 13:13; John 1:1; 20:28; etc.), which together provide a compelling picture.

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5. Claim: “The Holy Spirit Is Not a Person, Just God’s Power”

JWs claim that the Holy Spirit is not personal—He only “works”—and is not a third divine person.

Response: The Bible, however, shows a personal Holy Spirit: He is called the Helper, speaks, teaches, examines, and sends (John 14:26; 16:13; Acts 5:3-4). Accordingly, He is not just power, but a distinct divine person who acts in unity with the Father and the Son.

✅ Summary of Refutations

JW Objection	Biblical Counterevidence
Trinity only in the 4th century	Early Christian baptismal formulas, John’s teaching, Paul (“The grace of the Lord Jesus Christ, the love of God, and the fellowship of the Holy Spirit,” 2 Corinthians 13:13)
Jesus is created	Thomas → “My God,” Creator status (Colossians 1:15–20)
“The Word was a god”	Greek and context in the Gospel of John show: “The Word was God” – “The Word became flesh…”
Comma Johanneum is missing	Trinity is supported by numerous other texts
Spirit = Power	Biblical evidence for the Holy Spirit as a person: He speaks, sends, comforts

🧠 Conclusion on the Claims of Jehovah’s Witnesses

• The doctrine of the Trinity is the logical consequence of biblical teaching, bringing all New Testament statements about the Father, Son, and Spirit into harmony.
• Many objections from Jehovah’s Witnesses fail due to mistranslations, textual errors, or selective Bible interpretation.
• The overall biblical message and church tradition emphasize that Father, Son, and Holy Spirit are three persons of the same divine essence, united in the one God.

I used and summarized the following sources, partly with the help of ChatGPT—and of course, I checked and adapted everything the AI provided as a template:

• Online Dogmatics by Thomas Gerlach, article: Trinity Doctrine – Biblically Founded
• A very comprehensive article on dreieinigkeit.de: Trinity in the Bible
• Evangelium21: Is the Trinity Biblical?
• EKD: Trinity: Basic Knowledge of Faith