The Trinity is not an optional extra. It is not a theological hobby. It is the guardrail that keeps us worshiping the God who actually is, not the god we prefer. The Trinity is not a puzzle to solve, but a God to worship.

I love the Trinity. That is because I love God, and God is Triune.

When Christians say “God,” we do not mean a vague creator. We mean the Triune God, Father, Son, and Holy Spirit, one God in three persons.

That may sound like theology for specialists, but it is actually the bedrock of Christian faith. If we get God wrong, we will get everything else wrong. And if we keep God vague, we will never know whether we are talking about the living God of Scripture or a god made in our own image.

What do Christians mean by “the Trinity”?

Very few people have a firm grasp of the Trinity, so we need to define our terms.

The doctrine of the Trinity, stated simply, is that there is one eternal being of God, and this one divine being is shared fully and completely by three coequal, coeternal persons, the Father, the Son, and the Holy Spirit.

God is therefore one in essence and three in persons.

To keep our thinking clear, we need to distinguish between the words being and person.

Being answers the question: What is something?

Person answers the question: Who is someone?

A simple analogy I once heard is helpful here. A chair has being, it exists. But it does not have personhood. It has no mind, no will, no “self.” I do not ask its permission to sit on it, because it is not a “who.” It is a “what.” This distinction helps us understand the Trinity. God is one “what” (one divine being) shared by three “whos” (Father, Son, Spirit).

So when Christians speak of the Trinity, we are not saying “three gods.” Nor are we saying “one person pretending to be three persons.” We are saying something far more precise:

One divine what: one being, one essence

Three divine whos: three persons, Father, Son, and Holy Spirit

Is there mystery here? Yes. God is infinite. We are not. But mystery is not the same as contradiction. The Trinity is beyond us, but it is not against reason. It is the biblical revelation of who God is.

A common objection you may hear: “The Trinity is not in the Bible.”

Non-Trinitarian groups such as Jehovah’s Witnesses and the Church of Jesus Christ of Latter-day Saints (Mormons) often contend that Christians have simply made up the Trinity, pointing out that the term itself is not found in Scripture.

But the absence of a word does not prove the absence of the truth.

The word “Bible” is not found in the Bible either. Yet that does not trouble anyone. So when someone says, “Trinity is not in the Bible,” a fair reply is, “So what?” The real issue is whether Scripture teaches the reality the word describes.

The church did not create the Trinity, it summarized Scripture’s teaching. And when the church later met at Nicaea and other councils, it was not inventing the Trinity, it was defending the biblical confession against distortions.

That is exactly what Christians have done throughout the centuries. The word “Trinity” is a faithful summary of what Scripture clearly teaches when all the relevant passages are taken together.

Why do Christians believe the Trinity?

Christians believe the Trinity because three things are unmistakably taught in Scripture.

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