← Latinum Institute Ecclesiastical Latin Reading Course
The Verb of Divine Transformation in Sacred Scripture and Liturgy
This lesson explores one of the most theologically significant verbs in Ecclesiastical Latin: fīō, fierī, factus sum — meaning “to become,” “to be made,” or “to happen.” This irregular verb carries immense weight in Catholic theology, appearing at the most pivotal moments of salvation history.
Index:
https://latinum.substack.com/p/index
What does fīō mean in Ecclesiastical Latin?
The verb fīō expresses transformation, becoming, and the coming-into-being of things. In Church Latin, it carries profound theological significance: it is the verb of Creation (fiat lux — “let there be light”), of the Incarnation (Verbum caro factum est — “the Word became flesh”), of Mary’s consent (fiat mihi — “let it be done to me”), and of our daily surrender to God’s will (fiat voluntas tua — “thy will be done”).
Grammatically, fīō is remarkable: it has active forms but passive meaning, serving as the passive voice of faciō (”to make, to do”). Its principal parts are fīō, fierī, factus sum. The perfect system borrows from faciō: factus sum (I have become/was made), factus eram (I had become), factus erō (I shall have become).
In these fifteen examples, we shall encounter fīō in its sacred contexts: divine creation, liturgical prayer, theological discourse, and the writings of the Church Fathers.
Key Takeaways: -
Fīō is the passive of faciō but has active endings in the present system -
The perfect tenses use factus sum, eram, erō with the participle -
“Fiat” (3rd person singular subjunctive) expresses divine command and human submission -
This verb appears at the most crucial theological moments in Scripture -
Understanding fīō unlocks the language of transformation in Catholic theology
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fīō [ˈfi.o] — the long ī throughout present stem fierī [fiˈe.ri] — infinitive, stress on second syllable fīat [ˈfi.at] — present subjunctive third person singular factus [ˈfak.tus] — perfect participle factum est [ˈfak.tum est] — “it was made” / “it became”
Note: In Ecclesiastical pronunciation, c before e or i is pronounced [tʃ] as in “church,” but before a, o, u it is [k]. Thus fēcit is [ˈfe.tʃit] but factum is [ˈfak.tum].
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205.1 Fīat let-there-be lux light
205.2 Et and facta made est was lux light
205.3 Verbum the-Word caro flesh factum made est was
205.4 Fīat let-be-done mihī to-me secundum according-to verbum the-word tuum your
205.5 Fīat let-be-done voluntās the-will tua your sicut just-as in in caelō heaven et also in on terrā earth
205.6 Quod what factum made est was in in ipsō him vīta life erat was
205.7 Omnia all-things per through ipsum him facta made sunt were
205.8 Quid what fīet will-become dē of nōbīs us
205.9 Nōn not fīat let-be-done voluntās the-will mea my sed but tua your
205.10 Et and sīc thus factum done est was
205.11 Hoc this fierī to-happen oportet it-is-necessary
205.12 Quōmodo how fīet will-happen istud this
205.13 Ut that fīāmus we-may-become fīliī sons Deī of-God
205.14 Et and factum made est was vesperē evening et and māne morning diēs day ūnus one
205.15 Ōrātiō the-prayer Ecclēsiae of-the-Church fīēbat was-being-made sine without intermissiōne ceasing ad to Deum God prō for eō him
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205.1 Let there be light. (Genesis 1:3)
205.2 And light was made. (Genesis 1:3)
205.3 The Word was made flesh. (John 1:14)
205.4 Let it be done to me according to your word. (Luke 1:38 — The Annunciation)
205.5 Thy will be done on earth as it is in heaven. (Matthew 6:10 — The Lord’s Prayer)
205.6 What was made in Him was life. (John 1:4)
205.7 All things were made through Him. (John 1:3)
205.8 What will become of us?
205.9 Not my will but yours be done. (Luke 22:42 — Gethsemane)
205.10 And so it was done. (Common Vulgate phrase)
205.11 This must happen. / It is necessary that this come to pass.
205.12 How shall this happen? (Luke 1:34 — Mary’s question to Gabriel)
205.13 That we might become sons of God. (cf. John 1:12)
205.14 And there was evening and morning, the first day. (Genesis 1:5)
205.15 Prayer was being made unceasingly by the Church to God for him. (Acts 12:5)
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205.1 Fīat lux.
205.2 Et facta est lux.
205.3 Verbum caro factum est.
205.4 Fīat mihī secundum verbum tuum.
205.5 Fīat voluntās tua sicut in caelō et in terrā.
205.6 Quod factum est in ipsō vīta erat.
205.7 Omnia per ipsum facta sunt.
205.8 Quid fīet dē nōbīs?
205.9 Nōn fīat voluntās mea sed tua.
205.10 Et sīc factum est.
205.11 Hoc fierī oportet.
205.12 Quōmodo fīet istud?
205.13 Ut fīāmus fīliī Deī.
205.14 Et factum est vesperē et māne diēs ūnus.
205.15 Ōrātiō Ecclēsiae fīēbat sine intermissiōne ad Deum prō eō.
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Grammar Rules for This Passage:
The following grammatical points are essential for understanding the verb fīō in these sacred texts:
1. The Nature of fīō as a Semi-Deponent Verb
Fīō is grammatically peculiar: it has active forms but passive meaning. It serves as the passive voice of faciō (”I make, I do”). When you want to say “something is made” or “something becomes,” you use fīō rather than a passive form of faciō.
Present indicative: fīō, fīs, fit, fīmus, fītis, fīunt (”I become, you become, he becomes...”) Imperfect indicative: fīēbam, fīēbās, fīēbat... (”I was becoming...”) Future indicative: fīam, fīēs, fīet, fīēmus, fīētis, fīent (”I shall become...”) Present subjunctive: fīam, fīās, fīat, fīāmus, fīātis, fīant (”that I may become...”) Imperfect subjunctive: fierem, fierēs, fieret... (”that I might become...”) Present infinitive: fierī (”to become”)
2. The Perfect System Borrowed from faciō
For the perfect tenses, fīō uses the perfect passive participle factus, -a, -um combined with forms of esse:
Perfect: factus sum, factus es, factus est... (”I have become, I became”) Pluperfect: factus eram, factus erās, factus erat... (”I had become”) Future Perfect: factus erō, factus eris, factus erit... (”I shall have become”)
Note that the participle agrees in gender and number with the subject: facta est lux (feminine because lux is feminine).
3. The Subjunctive of Divine Command: fīat
The form fīat (3rd person singular present subjunctive) is extraordinarily important in Church Latin. It expresses:
a) Divine imperative: “Fīat lux” — God’s creative command, often called the “jussive subjunctive” b) Human submission: “Fīat voluntās tua” — surrender to God’s will c) Prayerful consent: “Fīat mihī” — Mary’s acceptance of God’s plan
This subjunctive use differs from Classical Latin optative expressions; in Church Latin it carries theological weight as the grammar of divine-human encounter.
4. Impersonal and Personal Constructions
Fīō can be used both personally (with a subject: Verbum factum est — “the Word was made”) and impersonally (without a subject: Hoc fierī oportet — “It is necessary that this happen”).
5. Common Ecclesiastical Constructions with fīō -
factum est + ut + subjunctive: “It came to pass that...” -
fierī potest ut: “It is possible that...” -
fierī nōn potest quīn: “It cannot but be that...” / “It must be that...” -
quid fīet dē + ablative: “What will become of...?”
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The Theology of Becoming in Catholic Thought
The verb fīō occupies a unique place in Catholic theology because it expresses the mystery of transformation — divine action bringing something new into existence or changing the nature of what already exists.
Creation and the Divine “Fiat”
In Genesis, God speaks creation into being with the word “fīat” — let there be. This creative command became so central to Jewish and Christian thought that the term “divine fiat” entered theological vocabulary in many languages. God does not labor or struggle to create; He speaks, and it is done (et sīc factum est).
The Incarnation: “Verbum caro factum est”
John 1:14 contains perhaps the most theologically dense use of fīō in all of Scripture. The Eternal Word, the Second Person of the Trinity, “became” flesh. This is not mere appearance or temporary assumption; it is genuine becoming. The Council of Chalcedon (451 AD) labored to express what this “becoming” means: Christ is truly God and truly man, without confusion or separation of natures. The Latin factum est preserves the mystery: something genuinely new came into being, yet the Word remained what He always was.
Mary’s Fiat: The Model of Christian Response
At the Annunciation, Mary’s response “Fīat mihī secundum verbum tuum” became the model of Christian faith. Her “fiat” echoes God’s creative “fiat” in Genesis — just as God’s word brought creation into being, Mary’s consent allowed the Word to become flesh. The Annunciation feast (March 25) celebrates this moment as the beginning of our redemption.
The Lord’s Prayer: Daily Surrender
Every time Christians pray “Fīat voluntās tua,” they echo both God’s creative power and Mary’s receptive faith. This prayer asks that God’s will be accomplished in us and through us, just as it is perfectly accomplished in heaven.
Liturgical Use
In the Latin liturgy, fīō appears in the Canon of the Mass, in hymns like the Pange Lingua (”Verbum caro panem verum / verbo carnem efficit” — the Word-made-flesh makes bread into true flesh), and throughout the Divine Office. Understanding this verb unlocks the theology expressed in Catholic worship.
Reminder: This lesson is designed for English speakers learning Ecclesiastical Latin.
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From the Prologue of Saint John’s Gospel (John 1:1-14, Vulgate)
This passage, read at the end of the traditional Latin Mass, contains the heart of Christian faith expressed through the verb fīō.
Part F-A: Interleaved Text
In in prīncipiō the-beginning erat was Verbum the-Word et and Verbum the-Word erat was apud with Deum God et and Deus God erat was Verbum the-Word. Hoc this erat was in in prīncipiō the-beginning apud with Deum God. Omnia all-things per through ipsum him facta made sunt were et and sine without ipsō him factum made est was nihil nothing. Quod what factum made est was in in ipsō him vīta life erat was et and vīta the-life erat was lux the-light hominum of-men. Et and Verbum the-Word caro flesh factum made est was et and habitāvit dwelt in among nōbīs us.
Part F-B: The Text from F-A with Translation
In prīncipiō erat Verbum, et Verbum erat apud Deum, et Deus erat Verbum. Hoc erat in prīncipiō apud Deum. Omnia per ipsum facta sunt, et sine ipsō factum est nihil. Quod factum est in ipsō vīta erat, et vīta erat lux hominum. Et Verbum caro factum est et habitāvit in nōbīs.
→ “In the beginning was the Word, and the Word was with God, and the Word was God. This was in the beginning with God. All things were made through Him, and without Him nothing was made. What was made in Him was life, and the life was the light of men. And the Word was made flesh and dwelt among us.”
Part F-C: Original Target Language Text of F-A Only
In prīncipiō erat Verbum, et Verbum erat apud Deum, et Deus erat Verbum. Hoc erat in prīncipiō apud Deum. Omnia per ipsum facta sunt, et sine ipsō factum est nihil. Quod factum est in ipsō vīta erat, et vīta erat lux hominum. Et Verbum caro factum est et habitāvit in nōbīs.
Part F-D: Grammar Commentary
This majestic passage uses the perfect passive participle factus three times, each with profound theological meaning: -
Omnia per ipsum facta sunt — “All things were made through Him.” The neuter plural omnia takes the plural facta sunt. The preposition per with the accusative indicates the agent through whom creation occurred. -
Sine ipsō factum est nihil — “Without Him nothing was made.” Here factum est is singular because nihil is singular. The double negative construction (sine... nihil) is emphatic rather than cancelling. -
Verbum caro factum est — “The Word became flesh.” This is the climactic use of fīō in the passage. Note that Verbum is neuter but factum est agrees with its grammatical gender, not with caro (which is feminine). The Latin construction expresses that the Word truly became flesh, not that flesh was added to the Word externally.
The repetition of erat (imperfect of sum, “was”) emphasizes the eternal existence of the Word, while factum est (perfect of fīō) marks the historical moment of the Incarnation — a contrast between timeless being and temporal becoming that lies at the heart of Johannine theology.
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The following dialogue, based on Luke 1:26-38, presents the exchange between the Angel Gabriel and the Blessed Virgin Mary in liturgical Latin style.
Part A: Interlinear Construed Text Part F-A: Interleaved Text
In in prīncipiō the-beginning erat was Verbum the-Word et and Verbum the-Word erat was apud with Deum God et and Deus God erat was Verbum the-Word. Hoc this erat was in in prīncipiō the-beginning apud with Deum God. Omnia all-things per through ipsum him facta made sunt were et and sine without ipsō him factum made est was nihil nothing. Quod what factum made est was in in ipsō him vīta life erat was et and vīta the-life erat was lux the-light hominum of-men. Et and Verbum the-Word caro flesh factum made est was et and habitāvit dwelt in among nōbīs us.