One God in Three Persons

The word Trinity does not appear even once in the Bible. And yet, few doctrines undergird the Christian faith as profoundly as this one. Paul closes one of his letters with a blessing that brings the three Persons together: “The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all” (2 Cor 13:14). This is not some distant theological detail, but a truth present in the very life of the church every time it gathers to worship. The name Trinity is ours, coined to summarize what has already been revealed; the truth it describes belongs to God and runs through the whole Bible, from Genesis to Revelation.

It all begins where Israel always began: there is one God. “Hear, O Israel: The LORD our God, the LORD is one” (Deut 6:4). The Christian faith has never let go of this confession. When we speak of the Father, the Son, and the Holy Spirit, we are not adding up three gods, but continuing to affirm that there is only one true God. This one divine essence, however, is not divided among three Persons like a cake cut into three slices. Each Person fully possesses the same divine essence. The Father is not a third of God, nor is the Son, nor the Holy Spirit. Each one is fully and completely God, because deity cannot be divided.

At the same time, this unity does not erase the distinction between the Persons. The three relate to one another in a real way, and one of the clearest scenes of this is at the baptism of Jesus. The Son stands in the waters of the Jordan, the Spirit descends on Him like a dove, and the Father's voice speaks from heaven: “This is my beloved Son, with whom I am well pleased” (Matt 3:17). There is no way to reduce this scene to a single character simply switching masks, as the ancient error called modalism taught. These are three distinct Persons, present at the same time, and yet one God.

This truth was not invented later on. It was drawn out of Scripture itself and revealed progressively. Already in Genesis, at the moment of the creation of man, God speaks in the plural: “Let us make man in our image, after our likeness” (Gen 1:26). This text, by itself, does not present the doctrine of the Trinity in full, but finds its fullest meaning in light of later revelation. In the New Testament, this revelation becomes clear: “In the beginning was the Word, and the Word was with God, and the Word was God” (John 1:1). The Son is distinct from the Father and, at the same time, fully God. The same is true of the Holy Spirit. When Ananias lied to the church, Peter affirmed that he had not lied to men, “but to God” (Acts 5:4), because to lie to the Holy Spirit is to lie to God Himself.

It is common to reach for comparisons to try to explain this mystery, such as water in its solid, liquid, and gaseous states, or the sun with its light and heat. These images can offer some help, but all of them break down at some point. That is why the Church has always warned that an analogy, at best, illustrates; it never proves anything. Water changing state can suggest the idea of one God who merely changes form, leading right back to the error of modalism. Light and heat from the same sun, in turn, can suggest that the Son and the Spirit are mere manifestations or effects of the Father, reducing them to something lesser. That is why, when explaining the Trinity to a child or a new convert, these comparisons must be used with caution, making clear that it is Scripture, not our illustrations, that defines who God is.

Knowing this doctrine is not merely an exercise in erudition; it is also a matter of discernment for our own day. The same error that, in the fourth century, demoted the Son to the status of a creature reappears, in many respects, among Jehovah's Witnesses. The answer remains the same declaration of Jesus: “Before Abraham was, I am” (John 8:58), an expression that echoes the very name by which God revealed Himself to Moses. Likewise, the ancient error of modalism, which dissolved the three Persons into different manifestations of one God, reappears today in groups that teach that Jesus is, at the same time, the Father and the Holy Spirit. It is also important to acknowledge honestly that a historical difference has separated the Christian East and West over the exact formulation of the procession of the Holy Spirit, a matter known as the Filioque controversy. This is a real theological and historical discussion, but it does not overturn the shared confession that there is one God in three Persons.

Faced with so great a mystery, two temptations are especially common: wanting to explain it away completely, or simply giving up on understanding it at all. Neither is the right response. God's own thoughts, Isaiah says, are higher than ours: “For my thoughts are not your thoughts, neither are your ways my ways” (Isa 55:8). God is greater than our minds, and that should not frighten us, but lead us to worship.

The next time you pray, try doing so consciously, as the Bible teaches: address the Father, in the name of the Son, by the power of the Holy Spirit. This is not an empty formula. It is remembering, in every prayer, that you have been adopted by the Father, redeemed by the Son, and sealed by the Spirit, and that the three Persons, united in one will, are, at this very moment, working for your good.