📖 Biblical Definition
Tertullian (c. 160-225) was the Carthaginian lawyer-turned-Christian-apologist whose Latin theological writing shaped the Western church’s vocabulary for centuries. He coined or popularized Trinitas ("Trinity"), persona ("person" of the Trinity), substantia ("substance"), sacramentum ("sacrament"), and many other foundational Latin terms. Major works: Apology (defense of Christianity to Roman authorities), Against Marcion, Against Praxeas (against modalism, articulating Trinity), On the Flesh of Christ, On Baptism. Famous lines: "the blood of the martyrs is the seed of the church"; "What hath Athens to do with Jerusalem?" He drifted into Montanism late in life, but his theological legacy persisted in the great church he had served.
📜 Webster 1828 Definition
Carthaginian Christian writer (c. 160-225); coined much of the Latin theological vocabulary.
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Born Carthage (Roman North Africa); legal training; converted around 197. Wrote prolifically in Latin (rare for Christian theology of his time, when most was Greek). About 31 works survive.
Major works: Apologeticum (defense of Christians against Roman charges), Adversus Praxean (formative Trinitarian treatise), De Praescriptione Haereticorum (the rule of faith argument), De Baptismo (the earliest baptismal treatise).
📖 Key Scripture
Matthew 28:19 — "Baptizing them in the name of the Father, and of the Son, and of the Holy Ghost."
John 1:1 — "In the beginning was the Word, and the Word was with God, and the Word was God."
1 Corinthians 8:6 — "But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him."
Acts 17:23 — "Whom therefore ye ignorantly worship, him declare I unto you."
⚠️ Modern Corruption
Modern Trinitarian language is much of it Tertullian's; the categories person and substance entered Christian usage through him.
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Three Persons, one Substance (tres personae, una substantia) is Tertullian's formulation against Praxeas. The categories shaped the Council of Nicaea (325) and the Athanasian Creed.
His later attraction to Montanism — an enthusiastic, apocalyptic movement — complicated his legacy. Catholic tradition does not name him a saint; Reformed tradition cites his theology while flagging his late-life trajectory. The vocabulary outlived the controversy.
🔗 Greek & Hebrew Roots
Latin Roman name; African Latin Christian context.
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Latin Tertullianus — from tertius (third) plus diminutive ending.
Note: famous epigram (commonly attributed to Tertullian, accuracy debated): credo quia absurdum — I believe because it is absurd. The closer attested form is certum est, quia impossibile (it is certain, because impossible).
Usage
"Three Persons, one Substance."
"Coined much of the Latin theological vocabulary."
"Apology, Against Praxeas, Prescription Against Heretics."