Justified True Belief

(P1) There is exactly one God. + Everything else about the Trinity sits inside this claim: the God of the Bible is one, and both Testaments say so flatly and often. (1) Israel's daily confession made God's oneness the first thing a child learned. - "Hear, O Israel: The LORD our God, the LORD is one" (Deuteronomy 6:4). This confession, called the Shema after its first Hebrew word, "hear," was recited morning and evening, and the first commandment stands behind it: "You shall have no other gods before me" (Exodus 20:3). - The Shema was not a theory kept on a shelf. Israelite parents were told to write these words on the doorframes of their houses (Deuteronomy 6:9), so a family brushed past them on the way in and on the way out, every day of their lives. (2) What set God apart was being the only Creator and the only Ruler. - Scholars call the Judaism of Jesus' day Second Temple Judaism, after the temple standing at the time: it runs from Israel's return from exile in the sixth century BC to that temple's destruction in AD 70. Across all of it the line between God and everything else was bright and unbudging. God made all things and God rules all things, and whatever else exists stands on the far side of that line. - "I am the LORD, who made all things, who alone stretched out the heavens, who spread out the earth by myself" (Isaiah 44:24). Alone. By myself. Creation is the job God insists he shares with no one. - Jewish writers did honor other figures, and those figures sort into two kinds. Some were made: angels like Michael, exalted patriarchs like Enoch. Others were God's own Word and God's own Wisdom, whom Proverbs pictures as a woman calling out in the street (Proverbs 1:20-21). Those two are spoken of as though they were people, but they are God's own, never a second party standing beside him. - Neither kind crossed the line, and worship is where you can see it. No Jewish group of the period folded a second figure into the worship of its own gatherings. Crossing would take a figure distinct from God and yet uncreated and sovereign in his own right, and the literature offers none: the exalted creatures were still creatures, and God's Word and God's Wisdom were still God's own. (3) The first Christians kept the confession without loosening it. - Jesus himself quotes the line every Jew knew: "You shall worship the Lord your God and him only shall you serve" (Matthew 4:10). - Paul, writing to a city crowded with idols, states it flatly: "there is no God but one" (1 Corinthians 8:4). One God and one mediator (1 Timothy 2:5); one God and Father of all (Ephesians 4:6). - James can even tease with it: "You believe that God is one; you do well. Even the demons believe—and shudder!" (James 2:19). A New Testament letter treats the Shema as so obviously true that the demons have it memorized. Therefore, whatever the rest of the doctrine says about Father, Son, and Spirit, it has to fit inside a monotheism that neither Testament ever loosens.

(P2) The Father is God, the Son is God, and the Holy Spirit is God. + The same Scriptures that insist on one God hand the name "God," and the honors that belong to God alone, to three. (1) The Father is called God on nearly every page. - Nobody disputes this one. In Jewish and early Christian usage the word "God" most often meant the Father, and the New Testament letters open with it out of sheer habit: "Grace to you and peace from God our Father" (Romans 1:7). - Jesus prays "Father, Lord of heaven and earth" (Matthew 11:25) and teaches his followers to begin, "Our Father in heaven" (Matthew 6:9). (2) The Son is called God in plain words. - John opens his Gospel with it: "the Word was God" (John 1:1). The letter to the Hebrews has the Father addressing the Son, "Your throne, O God, is forever and ever" (Hebrews 1:8). That line is lifted from a wedding song for an Israelite king (Psalm 45:6), and the writer knows exactly what he is doing with it: he is arguing that the Son outranks the angels, and two verses later he hands the Son a second psalm, about the Lord who laid the foundations of the earth (Hebrews 1:10). - The bluntest line belongs to Thomas. Eight days after the resurrection, a Jewish monotheist stands in front of a man he can touch and says to him, "My Lord and my God!" (John 20:28). John writes that Thomas said it to Jesus, so this is no gasp aimed past him at heaven. There is no dispute about what the manuscripts say, and no translation trick in it. Jesus does not correct him; he blesses everyone who will say the same with less evidence. - And they prayed to him. The Aramaic cry Maranatha, "our Lord, come!", survives untranslated inside a Greek letter (1 Corinthians 16:22), a prayer to Jesus old enough that Greek-speaking converts had learned it as a fixed phrase. Stephen died praying, "Lord Jesus, receive my spirit" (Acts 7:59), which is the prayer Luke had already recorded Jesus praying to the Father from the cross (Luke 23:46), with one name changed. Calling on the Lord's name was an act of worship, and a second figure receiving it is the one thing Jewish devotion had no room for. - Notice a habit of the writers: time after time, when Christ is called God, the same passage distinguishes him from the Father: "the Word was with God, and the Word was God." They knew exactly what they were claiming, and what they were not. (3) The Spirit is treated as God, not as God's electricity. - When Ananias lies about the price of a field, Peter says he has lied to the Holy Spirit, and in the next breath, "You have not lied to man but to God" (Acts 5:3-4). Lying to the Spirit simply is lying to God. - The Spirit speaks in the first person: "Set apart for me Barnabas and Saul for the work to which I have called them" (Acts 13:2). Me. I. A power does not commission missionaries for its own work. - Jesus sets blasphemy against the Spirit apart as the gravest possible offense, graver than a word spoken against himself (Luke 12:10). That is an astonishing thing to say about anything less than God. Therefore, the New Testament calls the Father God, the Son God, and the Spirit God, and it does all this while holding the Shema with both hands.

(P3) The Father, the Son, and the Holy Spirit are distinct persons. + Distinct means the Father is not the Son, the Son is not the Spirit, and the Spirit is not the Father: three who face one another, not one who wears three costumes. (1) All three appear at once, doing different things. - At Jesus' baptism the Son stands praying in the river, the Father speaks from heaven, "You are my beloved Son," and the Spirit descends on him like a dove (Luke 3:21-22). One scene, three actors, simultaneously. - No single person can be, in the same moment, the man in the water, the voice from heaven talking about the man, and the one descending on him. The scene refuses to be read as one performer changing masks. (2) They speak to and about one another. - The Son prays to the Father: "Father, glorify me in your own presence" (John 17:5). Nobody says that to himself. The Father, in turn, loved the Son "before the foundation of the world" (John 17:24), and love needs a beloved. - The Father sends the Son (John 3:17), and the Spirit is sent by the Father in the Son's name and by the Son from the Father (John 14:26; 15:26). Sender and sent are two. - Paul adds a quieter case: the Spirit intercedes for the saints, Paul's ordinary word for Christians, and the Father, who searches hearts, knows the mind of the Spirit (Romans 8:26-27). A knower and a known, each personal, facing each other. (3) The New Testament's own formulas count exactly three. - Disciples are baptized "in the name of the Father and of the Son and of the Holy Spirit" (Matthew 28:19). One name, three named. The Greek repeats the little word "the" in front of each one, which sets the three apart from each other rather than running them together. If two of the three were the same person, listing three would be careless at best and misleading at worst. - The pattern runs across independent authors: "The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit" (2 Corinthians 13:14); varieties of gifts, the same Spirit; of service, the same Lord; of activities, the same God (1 Corinthians 12:4-6); chosen by the Father, sanctified by the Spirit, sprinkled with the blood of Christ (1 Peter 1:2). - The count never wobbles. No triadic formula expands to four, and none contracts to two. Paul does once name a fourth party in an oath, charging Timothy "in the presence of God and of Christ Jesus and of the elect angels" (1 Timothy 5:21), and the difference is the whole point: angels stand there as witnesses to a charge, never inside the one name a convert is baptized into. Therefore, the three are not one actor in three roles; they address one another, love one another, send one another, and are counted side by side.

(C) Therefore, the one God exists in three distinct persons. + The conclusion adds nothing to the premises; it only refuses to drop any of them. In a deductive argument the premises are like a locked chain: if each link holds, the conclusion cannot slip out. (1) "Trinity" is shorthand for keeping all three premises at once. - Exactly one God (P1). Three who are each God (P2). Three who are distinct (P3). Say all three in one breath and you have said the doctrine; "Trinity" is the church's label for the whole sentence. - The label is younger than the sentence. The Latin trinitas appears around AD 200 in Tertullian, and the Greek trias a generation earlier in Theophilus of Antioch, roughly a century and a half after the crucifixion. What it abbreviates was already written down in the New Testament. - Each link has a modest, fair bar to clear: a premise need only be more plausible than its denial, not certain past all doubt. And nothing can be smuggled in at the end, because there is no last step. Every real dispute is a dispute about one of the three premises, and each of those stands on a stack of passages rather than on a favorite verse. (2) Person and being answer two different questions. - A thing's being is what it is; a person is who someone is. When something knocks at your door, "what is out there?" gets an answer like "a human being," and "who is out there?" gets a name. Two questions, two kinds of answer. - You are one being and one person: one what, one who. The claim about God is one what and three whos: one divine being, and Father, Son, and Holy Spirit, each of whom is fully God. - The playground arithmetic (1 + 1 + 1 = 3, therefore three Gods) adds up whos and announces the total as whats. The doctrine never says one being is three beings, or one person is three persons. (3) The doctrine refuses three familiar substitutes. - Not three Gods. Three separate divine beings is tritheism, and (P1) closes that door before it opens. - Not one person in three costumes. That is modalism, from "modes": one divine person playing Father, then Son, then Spirit, the way one actor takes three parts. (P3) forbids it, the baptism scene loudest of all. - Not one supreme God with two glorious lieutenants. That is Arianism, after the fourth-century Alexandrian teacher who held that the Son was the first and highest thing God made. (P2) forbids it: all three receive honors God refuses to share, and "my glory I give to no other" (Isaiah 42:8) leaves no room for junior partners. (4) Stating a truth and explaining its mechanics are different jobs. - The premises secure what God is and who God is. How one divine being lives as three persons is a further question, and the church has worked at it for eighteen centuries without pretending to have finished. - The famous puzzles attach mostly to the stricter claims added later to fence the doctrine, of the kind gathered in the summary known as the Athanasian Creed, rather than to the biblical sentences the premises quote. The sentences came first; the tightening came after. - A jury can know from the fingerprints and the receipts that the defendant did it while having no idea how he got in the house. Knowing that is one job and knowing how is another, and the premises deliver the first. Therefore, the God of the Bible is one God in three persons, Father, Son, and Holy Spirit, and that is what the word "Trinity" names.