What Is the Trinity? One God in Three Persons
Christians use the word Trinity to describe the one true God eternally existing as three distinct Persons: the Father, the Son, and the Holy Spirit. The word itself does not appear in the Bible. I use it because it brings together what Scripture teaches, and that is how any theological term should be judged. We need to understand the passages well enough to explain what we are confessing, rather than settle for a familiar word or an illustration that seems easy to picture.
One God in Three Persons
Essence describes what God is, the one divine being. Person distinguishes who the Father, Son, and Holy Spirit are. They are coequal and coeternal, meaning that each is fully God and has always existed. They act and relate to one another personally, without being three independent beings or portions that make up God. The Son does not possess a third of deity, with the Father and Spirit supplying what He lacks.
To understand this, we have to read several biblical teachings together. Scripture insists that there is only one God. It also identifies the Son and the Holy Spirit as God while distinguishing them from the Father and from each other. We find the three named together in baptism and blessings, and working together in salvation. An adequate explanation must account for all of those passages without discarding the ones that seem difficult.
Israel’s confession establishes that there is one God. His people lived among nations worshiping many gods, but the LORD commanded their exclusive allegiance:
“Hear, O Israel: The LORD our God, the LORD is one!”
This confession is called the Shema, after the Hebrew command to hear. The following verses tell Israel to love the LORD with the whole person. Monotheism means belief in one God, and Israel’s confession called for undivided allegiance to Him. If He alone is God, I cannot reserve an area of my life where I intend to disregard Him.
The word translated “one” is echad, the ordinary Hebrew word for one. It can describe a single unit or a unity, depending on the context; husband and wife, for example, become one flesh. That range is consistent with the fuller revelation of God, but the word itself does not prove the Trinity. We need to read the passages that identify the Father, Son, and Spirit and describe their relationship.
In Genesis 1, God uses the words “Our image” as He speaks of making man. I read this plural wording alongside the fuller revelation of God that follows. It is consistent with plurality in God, but the pronoun alone does not explain all the personal distinctions. The doctrine comes from the whole biblical testimony, so we should not ask one Hebrew word or one verse to carry the entire argument.
Isaiah leaves no room for divine rivals:
I am the LORD, and there is no other; There is no God besides Me. I will gird you, though you have not known Me,
If we imagine three independent gods cooperating, we have contradicted what the LORD says here. Calling them a Trinity would not correct the mistake. Whatever we say about the Father, Son, and Holy Spirit must preserve His declaration that there is no other God.
James also warns us against confusing a correct confession with saving faith:
You believe that there is one God. You do well. Even the demons believe–and tremble!
Demons know that God is one, yet they remain in rebellion against Him. I can likewise learn the right vocabulary and repeat an accurate statement while refusing His authority. Saving faith receives God as He has revealed Himself and trusts the Son He sent. The ability to define a doctrine cannot substitute for that response.
The Father and the Son Are God
The Father’s deity is rarely disputed among people who profess to follow the Bible. Paul addresses Him as God while distinguishing Him from the Lord Jesus Christ:
To all who are in Rome, beloved of God, called to be saints: Grace to you and peace from God our Father and the Lord Jesus Christ.
Recognizing the Father as God does not make the Son or Spirit less divine. Scripture describes an order in redemption: the Father sends the Son, the Son willingly comes, and the Spirit applies His completed work. These are different actions within the united work of God, not different degrees of deity. John describes the Father’s giving of His Son as an expression of His love:
For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.
The Father loves the world, and the promise of everlasting life extends to whoever believes in His Son. Christ died for the whole world. I would be misrepresenting the God this verse reveals if I explained His love in a way that made His invitation insincere. He genuinely offers salvation, and those who believe are saved.
The Son did not begin to exist at Bethlehem. John opens his Gospel by telling us that the Word was already there in the beginning, both with God and Himself God:
In the beginning was the Word, and the Word was with God, and the Word was God.
We need both statements. Being with God distinguishes the Word personally from the Father; being God identifies His divine nature. Neither a created angel nor a lesser deity would fit John’s description. John then explains how this eternal Word came to live among us:
And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth.
This is the incarnation: the eternal Son became truly human without ceasing to be God. He did not merely look human, and He did not become a Person for the first time. The One who eternally knew the Father took real human flesh. His deity enables Him to reveal the Father, and His humanity enables Him to stand in our place as the sinless substitute.
After Jesus rose bodily from the dead, Thomas addressed Him directly:
And Thomas answered and said to Him, “My Lord and my God!”
Jesus accepted Thomas’s confession without rebuking him for blasphemy. Thomas was right to call Him Lord and God. Scripture also teaches that all things were made through the Son, and Paul says He continues to hold creation together:
And He is before all things, and in Him all things consist.
Everything created owes its existence to the Son, who existed before it and continues to sustain it. He cannot therefore be one of the things He created. Jesus also said that people should honor the Son just as they honor the Father, and that dishonoring Him dishonors the Father who sent Him. Worshiping Christ gives Him the honor He deserves. A Complete Bible Study on the Deity of Jesus examines this evidence further.
The Holy Spirit Is God and Personally Distinct
Describing the Holy Spirit as a force or a spiritual atmosphere does not account for how Scripture presents Him. He speaks to God’s servants and guides them, teaches according to His will, and bears witness to the truth. He knows how His people respond to Him, and their conduct can grieve Him. Peter’s confrontation with Ananias also shows that a person can lie to Him:
But Peter said, “Ananias, why has Satan filled your heart to lie to the Holy Spirit and keep back part of the price of the land for yourself? While it remained, was it not your own? And after it was sold, was it not in your own control? Why have you conceived this thing in your heart? You have not lied to men but to God.”
Ananias was free to keep the land or retain the proceeds. Peter’s accusation concerned his deliberate deception, not a requirement that he surrender every possession. Peter identified that offense first as lying to the Holy Spirit and then as lying to God. Ananias had lied to a divine Person, rather than mishandled an impersonal power.
Jesus’ promise of another Helper also reveals a personal relationship:
And I will pray the Father, and He will give you another Helper, that He may abide with you forever.
Parakletos means Helper or Advocate. The word translated “another,” allos, can describe another of the same kind, fitting Jesus’ promise of continuing personal help. The relationships in His words are explicit: the Son asks the Father, and the Father gives the Helper who will remain with His people. Jesus is not promising a lesser replacement or a religious energy they will learn to control.
The Spirit convicts people of sin and brings regeneration, genuine new birth. He dwells within those who believe, teaching and empowering them. His presence is also a seal marking the believer as God’s own:
And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption.
That seal gives the believer assurance grounded in God’s saving work. God does not give us new birth and then leave us to preserve ourselves by sheer determination. Yet Paul tells these same sealed believers not to grieve the Spirit. If I excuse dishonesty or cruelty as something private, I am disregarding the divine Person who dwells within me and is grieved by my conduct. Security in Christ gives me no excuse to continue what the Spirit calls me to put away. A Complete Bible Study on the Person of the Holy Spirit considers His ministry in greater detail.
The Spirit’s deity does not make Him the same Person as the Father or Son. Jesus prayed to the Father who sent Him, and Scripture speaks of the Spirit being sent by both. At Jesus’ baptism, we see the three acting distinctly in the same event:
When He had been baptized, Jesus came up immediately from the water; and behold, the heavens were opened to Him, and He saw the Spirit of God descending like a dove and alighting upon Him. And suddenly a voice came from heaven, saying, “This is My beloved Son, in whom I am well pleased.”
The Son came up from the water, the Spirit descended upon Him, and the Father spoke from heaven about His beloved Son. This was a real relationship, not one Person pretending to be someone else. The Father truly sent and loved the Son, and the Son truly obeyed Him. Scripture presents the Persons loving and glorifying one another while sharing the one divine essence.
Scripture Names the Three Together
Jesus also named the Father, Son, and Spirit together when He commissioned His disciples. He commanded them to make disciples of all nations and baptize them:
Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,
Jesus uses the singular “name” while naming each Person distinctly. We need to retain both features of His command. He does not tell the disciples to acknowledge three unrelated gods, nor does He identify the Father, Son, and Spirit as interchangeable titles for one Person. Paul likewise names all three in his closing blessing to the Corinthians:
The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Spirit be with you all. Amen.
The grace of Christ, the Father’s love, and fellowship with the Spirit belong together in this blessing. Paul names the Son and Spirit alongside the Father in his instruction to the church. He describes how believers approach God in the same way:
For through Him we both have access by one Spirit to the Father.
We come through Christ, by the Spirit, to the Father. This is the access sinners have received through God’s saving work. I cannot dismiss the Trinity as a technical subject for people who enjoy theological disputes when these passages describe the God I approach in prayer and how He has brought me near.
Another passage naming the three together is 1 John 5:7. I follow the Textus Receptus, or received Greek text of the New Testament, and I receive this verse as Scripture. The heavenly-witness wording is disputed in modern critical-text traditions, but I do not believe it should be discarded:
For there are three that bear witness in heaven: the Father, the Word, and the Holy Spirit; and these three are one.
This clearly names the three Persons and affirms their unity. My understanding does not depend on this verse alone. The passages already examined teach one God, identify the Son and Spirit as fully divine, and distinguish the Persons from one another. I receive 1 John 5:7 as a clear witness consistent with that whole testimony.
Tritheism means treating the Persons as separate gods, which contradicts Deuteronomy and Isaiah. Modalism means treating God as one Person appearing in different roles. That cannot explain the Son praying to the Father or the Father giving the Spirit as another Helper. These terms identify actual errors about God, not merely different ways of expressing the same belief.
Familiar illustrations can introduce those errors even when we mean well. Water changing into ice or vapor suggests one Person changing forms. An egg suggests partialism, the idea that each Person is only part of God, because the shell, white, and yolk are portions of the whole. The sun with its light and heat can blur the personal distinctions. An image may be easy to remember while leaving someone with a mistaken understanding of God. I would rather explain the biblical statements than rely on an object lesson that misrepresents Him.
I do not have to comprehend every aspect of God’s eternal life before trusting what He reveals. Confessing one essence and three Persons is not a contradiction: one describes the divine being, while three describes the Persons who share that being. We can speak accurately while admitting the limits of our understanding. The trouble begins when we insist that God must fit an illustration and remove part of the biblical testimony to make Him easier to picture.
The Triune God Saves and Deserves Worship
The Father sent His Son out of love for the world, and the Son willingly came, becoming fully human through the virgin birth while remaining fully God. The Spirit gives new life to believers and applies the redemption Christ accomplished. We are describing the united saving work of the one God.
Jesus lived without sin and willingly gave Himself to be slain as the perfect sacrifice for our sins. Wicked people inflicted His bodily torture and death. His offering was complete through His shed blood and death before He was buried and rose bodily. The Father did not punish, curse, abandon, strike, bruise, or pour wrath on Jesus. Father and Son remained united in redemption.
For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him.
Paul expressly says that Christ knew no sin. Being made sin for us concerns His sacrificial offering for our sins; He did not become personally wicked. The eternal Son truly became human and stood in our place, giving His sinless life so that we could become righteous in Him.
Salvation also involves new life within the person who believes. Paul attributes that renewal to God’s mercy and the Holy Spirit:
not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit,
Regeneration is God’s work of making someone new. A person can adopt Christian manners or call himself a Christian without having been born again. We are saved according to God’s mercy, on the ground of Christ’s completed work. Good works grow out of that changed life; they cannot purchase forgiveness. Soteriology: The Study of Salvation examines these truths more fully.
Christ’s provision is for the whole world, and God’s offer is genuine even though people can resist and finally reject Him. Whoever repents and believes is forgiven and justified, meaning declared righteous before God. The Holy Spirit gives that person new life, comes to dwell within him, and seals him for the day of redemption. Every genuine believer is eternally secure, but security gives no permission for lawlessness. We should look for evidence of new life, rather than assume that a profession of faith proves someone has been born again.
The Father and Son receive divine honor, and the Spirit deserves that same honor. In worshiping each Person, we worship the one God. I cannot confess that the Son is fully God and then treat worship as something belonging only to the Father. Nor should I speak of the Spirit as a resource I can use while overlooking His holiness. Our worship should agree with what we confess about Him.
The New Testament often describes prayer as coming to the Father through the Son by the Spirit. That pattern should shape my understanding, but I should not use it as a mechanical rule to reject prayers Scripture itself records. Stephen addressed the Lord Jesus as he was dying, and the church calls on the Lord’s name. The Spirit also helps us in our weakness. In each case, our access depends on Christ’s mediation and the Spirit’s work.
My Final Thoughts
I use the word Trinity because these passages lead me to confess one God and three distinct, fully divine Persons. I would rather acknowledge what I cannot fully comprehend than settle for an explanation that misrepresents Him. But learning the terms should also deepen my gratitude. The Father sent His beloved Son, who willingly gave His life for us, and the Spirit gives new life and dwells within believers. When I seek mercy in prayer, I come to the Father through Christ and by the Spirit. The doctrine describes the God who has provided that access, and I want my worship to reflect who He has revealed Himself to be.