The Mystery at the Heart of the Faith
Of all the truths revealed in Scripture, none is more central, more profound, or more humbling to the human mind than the doctrine of the Trinity. It is not a doctrine men would ever have invented, for it confounds our arithmetic and exceeds our comprehension. Yet it is the unmistakable testimony of the whole Word of God, woven from Genesis to Revelation, and the Christian church in every age has confessed it as the foundation of all true worship. The God we adore is one God, eternally existing in three distinct Persons: the Father, the Son, and the Holy Ghost, the same in substance, equal in power and glory.
Let it be said plainly at the outset what the doctrine does not teach. It does not teach that there are three Gods; that would be the error of tritheism. Nor does it teach that the one God merely appears in three different roles or masks, now as Father, now as Son, now as Spirit; that ancient error is called modalism, and it denies the real and eternal distinction of the Persons. Nor does it teach that the Son and the Spirit are lesser, created beings beneath the Father; that is the error of Arius. The Scriptures hold two truths together without compromise: God is one in essence, and God is three in Person. We do not divide the substance, nor do we confound the Persons.
The Foundation: God Is One
Before we say anything of the three, we must establish the one, for the Bible is emphatic and unwavering that there is but one God. This was the great confession of Israel, the words a faithful Jew recited morning and evening:
The Lord declares through Isaiah, “I am the LORD, and there is none else, there is no God beside me” (Isaiah 45:5), and again, “Is there a God beside me? yea, there is no God; I know not any” (Isaiah 44:8). The New Testament says the same: “there is none other God but one” (1 Corinthians 8:4); “Thou believest that there is one God; thou doest well” (James 2:19). The doctrine of the Trinity is not a retreat from this truth but its deepest form. Whatever we confess of Father, Son, and Spirit, we never confess three Gods. There is one divine Being, one undivided essence, one God.
It is worth noticing that the Hebrew word for “one” in the Shema, echad, is the same word used when a man and his wife become “one flesh” (Genesis 2:24), and when the evening and the morning were “the first day,” literally “day one” (Genesis 1:5). It speaks of a true and complete unity, but not necessarily a bare, solitary numeral. The oneness of God is the oneness of a single divine nature, not the loneliness of a single Person.
Yet Within the One, a Plurality
From the opening pages of Scripture, there are hints of a fulness within that oneness that the Old Testament does not fully unfold but everywhere prepares. The most common Hebrew name for God, Elohim, is plural in form, yet it is regularly joined to singular verbs: “In the beginning God [Elohim] created [singular] the heaven and the earth” (Genesis 1:1). At the creation God says, “Let us make man in our image” (Genesis 1:26), a plural that cannot be mere royal speech, for man is then made “in his own image” (Genesis 1:27), the image of the one God. After the fall the LORD says, “the man is become as one of us” (Genesis 3:22); at Babel, “Go to, let us go down” (Genesis 11:7); and in Isaiah’s vision, “Whom shall I send, and who will go for us?” (Isaiah 6:8).
The Spirit of God moves upon the face of the waters (Genesis 1:2). The Angel of the LORD appears to Hagar, to Abraham, and to Moses in the burning bush, and speaks as God Himself, receiving worship that no created angel would accept (Genesis 16:10–13; 22:11–12; Exodus 3:2–6). David hears the LORD speak to another whom David calls Lord: “The LORD said unto my Lord, Sit thou at my right hand” (Psalm 110:1). The psalmist addresses the King as God, and then says that God has anointed Him: “Thy throne, O God, is for ever and ever … therefore God, thy God, hath anointed thee” (Psalm 45:6–7). And in Isaiah, the One who speaks declares, “and now the Lord GOD, and his Spirit, hath sent me” (Isaiah 48:16), where the Sender, the Spirit, and the One sent are all present in a single verse. These are not the doctrine in full bloom, but they are the seed of it, awaiting the fuller light of the New Testament.
The Three Are Named Together
When the Son came and the Spirit was poured out, the veil was drawn back. At the baptism of the Lord Jesus all three Persons are present at once and distinctly: the Son stands in the water, the Spirit descends as a dove, and the Father’s voice speaks from heaven, “This is my beloved Son, in whom I am well pleased” (Matthew 3:16–17). And the Lord Himself, commissioning His church, joined the three under a single name:
Mark the precision of it. It is “the name,” singular, for the three are one God; yet that one name embraces the Father, and the Son, and the Holy Ghost, three distinct Persons named in order and in equality. The apostolic benediction does the same: “The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Ghost, be with you all” (2 Corinthians 13:14). Peter greets the elect “according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ” (1 Peter 1:2). Paul writes of “one Spirit … one Lord … one God and Father of all” (Ephesians 4:4–6). Jude exhorts, “praying in the Holy Ghost, keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ” (Jude 20–21). No mere creature is ever joined to God in such formulas of worship and blessing.
The Father Is God
That the Father is God few have ever denied. He is called “God the Father” throughout the epistles, “the God and Father of our Lord Jesus Christ” (Ephesians 1:3). The Lord Jesus prayed to Him as “the only true God” (John 17:3), not to deny His own deity, for in the same prayer He speaks of the glory He had with the Father “before the world was” (John 17:5), but to set the one true God against the idols of the nations. The Father is the fountain of the Godhead, from whom are all things. This is the plainest of the three confessions and needs little defense.
The Son Is God
The deity of the Son is the truth most fiercely attacked and most gloriously defended in Scripture. John opens his Gospel with it in words that cannot be evaded:
The Word was with God, distinct in Person, and the Word was God, one in essence. Thomas fell before the risen Christ and cried, “My Lord and my God” (John 20:28), and the Lord received the worship rather than rebuking it. Paul writes that in Christ “dwelleth all the fulness of the Godhead bodily” (Colossians 2:9), that He is “God over all, blessed for ever” (Romans 9:5), and that we look for “the glorious appearing of the great God and our Saviour Jesus Christ” (Titus 2:13). The Father says of the Son, “Thy throne, O God, is for ever and ever” (Hebrews 1:8), and commands, “let all the angels of God worship him” (Hebrews 1:6).
The New Testament takes passages that speak of Jehovah and applies them directly to Jesus. Isaiah saw “the King, the LORD of hosts” high and lifted up (Isaiah 6:1–5); John says, “These things said Esaias, when he saw his glory, and spake of him,” meaning Christ (John 12:41). Jehovah swore, “unto me every knee shall bow, every tongue shall swear” (Isaiah 45:23); Paul says that “at the name of Jesus every knee should bow … and that every tongue should confess that Jesus Christ is Lord” (Philippians 2:10–11). Joel promised that “whosoever shall call on the name of the LORD shall be delivered” (Joel 2:32); Paul applies it to calling on the Lord Jesus (Romans 10:9–13).
Christ also did what only God can do. He forgave sins, and His enemies rightly asked, “who can forgive sins but God only?” (Mark 2:5–7). He is the Creator of all things (John 1:3; Colossians 1:16), the One who upholds “all things by the word of his power” (Hebrews 1:3). His “goings forth have been from of old, from everlasting” (Micah 5:2). He said, “Before Abraham was, I am” (John 8:58), taking the very name God revealed to Moses (Exodus 3:14). To deny the full deity of Christ is to deny the gospel itself, for only God could bear the infinite weight of sin and reconcile sinners to Himself.
The Holy Ghost Is God
The Holy Ghost, likewise, is not a mere influence or impersonal force, but a divine Person, fully God. When Ananias lied to the Holy Ghost, Peter said, “thou hast not lied unto men, but unto God” (Acts 5:3–4), equating the Spirit with God in a single breath. The Spirit possesses the attributes of God: He is eternal (Hebrews 9:14), omniscient, searching “the deep things of God” (1 Corinthians 2:10–11), and omnipresent: “Whither shall I go from thy spirit?” (Psalm 139:7). He does the works of God: creating (Job 33:4), inspiring the Scriptures (2 Peter 1:21), regenerating (John 3:5–8), and raising the dead (Romans 8:11). The believer’s body is “the temple of the Holy Ghost” (1 Corinthians 6:19), and because the Spirit dwells there, believers are “the temple of God” (1 Corinthians 3:16).
He is a Person, not a power. He speaks: “the Holy Ghost said, Separate me Barnabas and Saul” (Acts 13:2). He teaches (John 14:26), testifies (John 15:26), guides (John 16:13), forbids (Acts 16:6–7), intercedes “with groanings which cannot be uttered” (Romans 8:26), distributes gifts “as he will” (1 Corinthians 12:11), and can be grieved (Ephesians 4:30), resisted (Acts 7:51), and blasphemed (Matthew 12:31). He is named with the Father and the Son as their equal, and so we worship Him as God.
Three Persons, Not Three Masks
If the Father, the Son, and the Spirit were only three names or roles of a single Person, as Oneness teachers claim, much of the New Testament would make no sense. The Son prays to the Father, not to Himself: “O Father, glorify thou me with thine own self with the glory which I had with thee before the world was” (John 17:5). The Father loved the Son “before the foundation of the world” (John 17:24). Love requires a lover and a beloved; before anything was created, the Father and the Son shared eternal love and glory.
The Lord appealed to the law that “the testimony of two men is true,” and said, “I am one that bear witness of myself, and the Father that sent me beareth witness of me” (John 8:17–18): two witnesses, not one. He promised that the Father would send “another Comforter” (John 14:16), another, distinct from Himself. The Son was sent by the Father (John 3:16–17), and the Spirit is sent by the Father and the Son (John 14:26; 15:26). The Father is not the Son, the Son is not the Spirit, and the Spirit is not the Father; yet each is God, and there is one God.
Eternal Relations: Begotten and Proceeding
How are the three Persons distinguished, if they share one nature? Scripture answers by their eternal relations. The Father is of none. The Son is “the only begotten of the Father” (John 1:14), “the only begotten Son, which is in the bosom of the Father” (John 1:18). This is not a beginning in time, as if there were once when the Son was not; it is an eternal relation, as the brightness of the sun is as old as the sun itself. Christ is “the brightness of his glory, and the express image of his person” (Hebrews 1:3). The Spirit is “the Spirit of truth, which proceedeth from the Father” (John 15:26), and He is also called “the Spirit of his Son” (Galatians 4:6) and “the Spirit of Christ” (Romans 8:9).
There is an order among the Persons, the Father sending, the Son sent, the Spirit sent by both, but never an inequality of nature. When the Son says, “my Father is greater than I” (John 14:28), He speaks as the One who had taken the form of a servant and humbled Himself (Philippians 2:6–8), not denying that He is “equal with God.” The same Lord who said “my Father is greater than I” also said, “I and my Father are one” (John 10:30), and the Jews took up stones because they understood Him to be making Himself God (John 10:33).
Answering the Common Objections
“The word Trinity is not in the Bible.” True, but the doctrine is. The word is simply a summary of what Scripture teaches: one God, three Persons. The word “Bible” is not in the Bible either. Christians were using the term long before the Council of Nicaea; Theophilus of Antioch spoke of the “triad” of God around AD 180, and Tertullian used the Latin trinitas in the early 200s.
“Christ is the firstborn of every creature, so He was created.” The word “firstborn” in Colossians 1:15 speaks of rank and preeminence, not of origin. God said of David, the youngest son of Jesse, “I will make him my firstborn, higher than the kings of the earth” (Psalm 89:27). And the very next verse explains why Christ is firstborn: “For by him were all things created” (Colossians 1:16). He is not the first of the creatures; He is the Creator of them all.
“Christ is the beginning of the creation of God.” In Revelation 3:14 the word “beginning” (archē) means the source and ruler of creation, not its first product. The same Lord calls Himself “Alpha and Omega, the beginning and the ending” (Revelation 1:8; 22:13), titles that belong to the eternal God alone.
“Jesus did not know the day or the hour.” In His true human nature the Lord Jesus grew “in wisdom and stature” (Luke 2:52) and voluntarily limited the use of His divine knowledge in the days of His humiliation (Mark 13:32). He is one Person with two natures, truly God and truly man. That He became man does not mean He ceased to be God.
“The Trinity is unreasonable.” It is above reason, but not against it. We do not say that God is one and three in the same sense, which would be a contradiction; we say He is one in essence and three in Person. We are not asked to comprehend the infinite God with our finite minds, but to believe what He has revealed of Himself. A God small enough to be fully understood would not be God at all.
The Witness of 1 John 5:7
Modern versions remove this verse, and many treat it as a late addition. Defenders of the King James Bible, such as Edward F. Hills in The King James Version Defended, have answered that the verse has a long history in the Latin-speaking churches, and that Cyprian of Carthage, around AD 250, already wrote of the Father, the Son, and the Holy Ghost, “And these three are one.” They also point out that without verse 7, the Greek of verse 8 is grammatically awkward. Whatever one’s view of the debate, the doctrine of the Trinity does not stand or fall on a single verse; it rests on the whole testimony of Scripture, as we have seen. But 1 John 5:7 states plainly what the rest of the Bible everywhere teaches.
How the Church Has Confessed It
Because heresies arose early, some denying the Son’s deity, others the Spirit’s, others the distinction of the Persons, the church was compelled to state plainly what Scripture teaches. When the Alexandrian presbyter Arius taught that the Son was a created being, the Council of Nicaea in AD 325 confessed that the Son is “of one substance with the Father,” and Athanasius stood almost alone for years defending that truth. The Council of Constantinople in AD 381 confessed the full deity of the Holy Spirit. The ancient confession known as the Athanasian Creed put it with great care: that we worship one God in Trinity, and Trinity in Unity; neither confounding the Persons, nor dividing the substance; the Father, the Son, and the Holy Ghost each uncreated, eternal, almighty, and God, and yet there are not three Gods, but one God.
Our Baptist forefathers confessed the same truth. The Second London Baptist Confession of 1689 states: “In this divine and infinite Being there are three subsistences, the Father, the Word or Son, and Holy Spirit, of one substance, power, and eternity, each having the whole divine essence, yet the essence undivided.” This is not the adding of human philosophy to Scripture; it is the faithful summary of what Scripture says, set as a fence against error.
A Warning Against the Old and New Errors
The same heresies the early church faced are alive in our own day, often under new names.
| Group | What They Teach | What Scripture Says |
|---|---|---|
| Jehovah’s Witnesses | The Son is a created being (Michael the archangel); the holy spirit is an impersonal force | “The Word was God” (John 1:1); lying to the Holy Ghost is lying to God (Acts 5:3–4) |
| Oneness Pentecostals | One Person who appears as Father, Son, and Spirit | The Son prays to the Father; “another Comforter” (John 14:16; 17:5) |
| Mormons (LDS) | Father, Son, and Holy Ghost are three separate gods | “There is no God beside me” (Isaiah 45:5) |
| Islam | Rejects the Trinity, which the Qur’an appears to picture as God, Jesus, and Mary (Surah 5:116) | The Trinity is Father, Son, and Holy Ghost (Matthew 28:19) |
| Unitarians and liberals | Jesus was only a great man and teacher | “God over all, blessed for ever” (Romans 9:5) |
To all of these the answer is the same: “Whosoever denieth the Son, the same hath not the Father” (1 John 2:23). A false God cannot save, and a false Christ cannot redeem.
The Trinity in Our Salvation
This is no abstract puzzle for theologians; it is the ground of our salvation. The whole work of redemption is Trinitarian. Paul’s great hymn of praise in Ephesians 1 moves from Person to Person: the Father “hath chosen us in him before the foundation of the world” (v.4) and “predestinated us unto the adoption of children by Jesus Christ” (v.5); in the Son “we have redemption through his blood, the forgiveness of sins” (v.7); and believers are “sealed with that holy Spirit of promise, which is the earnest of our inheritance” (vv.13–14).
In sovereign grace the three Persons work as one. The Father gave a people to the Son before the world began (John 6:37; 17:6). The Son laid down His life for those sheep (John 10:11, 15) and purchased them with His own blood (Acts 20:28). The Spirit regenerates them, so that they are “born, not of blood, nor of the will of the flesh, nor of the will of man, but of God” (John 1:13), and seals them unto the day of redemption (Ephesians 4:30). “But after that the kindness and love of God our Saviour toward man appeared, not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost; which he shed on us abundantly through Jesus Christ our Saviour” (Titus 3:4–6). Take away any of the three Persons, or confound them into one, and the gospel collapses.
The Trinity in Prayer and Worship
The triune God is not merely a doctrine the Christian holds; He is the God the Christian loves, worships, and will adore forever. We pray to the Father, through the Son, by the Spirit: “For through him we both have access by one Spirit unto the Father” (Ephesians 2:18). Because God has sent forth “the Spirit of his Son into your hearts,” the believer cries, “Abba, Father” (Galatians 4:6). The Spirit Himself bears witness with our spirit that we are the children of God (Romans 8:16), and helps our infirmities when we know not what to pray for as we ought (Romans 8:26).
The Christian life, from first to last, is lived in fellowship with the three-in-one God: “truly our fellowship is with the Father, and with his Son Jesus Christ” (1 John 1:3), through “the communion of the Holy Ghost” (2 Corinthians 13:14). And heaven itself resounds with praise to the thrice-holy God:
Let us then bow before this God in humble adoration, not presuming to weigh the Infinite in the scales of our reason, but receiving with faith and wonder the God who has made Himself known: one in essence, three in Person, glorious in all His works, and worthy of everlasting praise. To the Father, and to the Son, and to the Holy Ghost, be glory now and forever. Amen.