(Part 10 of 11) The Trinity - Part 3 - Doctrines, Heresies, and Creeds
April 19, 2026 Preacher: Quinn Clement-Schlimm Series: Sunday School: Doctrine of God
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Part 10 of 11 in the Doctrine of God series
- Trinity/Christology Doctrines
Key Concepts
In order to articulate our doctrine of the Trinity and our doctrine of Christ, we must (1) distinguish between “nature” and “person” and (2) understand the divine nature and human nature.
- Nature/Essence/Substance: the what a thing is.
- Person/Hypostasis/Subsistence: the who that exists and acts.
- Key Rule: Natures do not act. Persons act according to their natures.
- Divine Nature: one simple, infinite, eternal essence of God, identical with His attributes.
- Human Nature: what makes a person truly human, consisting of a body united to a human soul, including the faculties, or powers, of the soul (mind/intellect, will, and affections).
- A body is essential (necessary) to human nature. Sin is accidental (not necessary).
Key Doctrines
- Monotheism: We believe in one God.
- Divine Simplicity: The one God is one in essence, equal to all of God’s attributes.
- Trinity: The one God exists in three persons, Father, Son, and Holy Spirit.
- Eternal Relations of Origin: Each person fully and equally possesses the one undivided divine nature and is distinguished only by their eternal relations of origin (Father is unbegotten, Son is begotten of the Father, Holy Spirit proceeds from the Father and the Son)
- Inseparable Operations: All three persons act inseparably in every external work.
- Classic formula: From the Father, through the Son, by the Spirit.
- Appropriation: Because Scripture sometimes emphasizes one person in a particular work, a person may “appropriate” a particular work.
- Perichoresis (mutual indwelling): each person of the Trinity indwells with other persons.
- Incarnation: In the fullness of time, the Son, without ceasing to be what He is eternally, assumed a true human nature.
- Hypostatic Union: In the one person of Christ there subsist two whole, perfect and distinct natures, divine and human, without confusion, change, division, or separation, each nature retaining its own proper attributes, yet united in one person for our salvation.
- Communication of Idioms: What is true of either nature can be asserted of the person of Christ.
- Theandric Operations: Christ acts as one person through both natures, such that all His actions are the acts of one person, performed according to either or both natures.
- Christ suffers (human nature)
- Christ upholds the universe (divine nature)
- Christ mediates for believers (human + divine nature)
- Heresies
Trinitarian Heresies

- Polytheism: the belief in multiple gods (e.g. Hinduism).
- Tritheism: the belief that the three persons of the Trinity are three distinct gods (e.g. Mormonism).
- Functional tritheism: Treating the persons as three independent centres of action/will - inseparable operations, imagining the Trinity as a committee or council , attributing different degrees of deity
- Modalism: the belief that God is one person who manifests Himself in three different modes: Father, Son, and Spirit” (e.g. Oneness Pentecostalism)
- Unipersonal Monotheism: the belief that the one God exists as a single divine person (e.g. Judaism & Islam)
Historical Christological Heresies (That Won’t Die)
- Denial of Full Deity (Against Nicaea)
- Ebionism: denied Christ’s divinity while revered Jesus as the Messiah.
- Modern analogues: Unitarian-leaning Christian groups
- Arianism: denied Christ’s divinity; Christ was the greatest and first created being, similar but not identical to the Father’s essence.
- Modern analogues: Jehovah’s Witnesses, Mormonism.
- Adoptionism: Christ was not divine by nature but adopted as the Son at his baptism.
- Denial of Full Humanity (Against Constantinople)
- Docetism: denied Christ’s humanity, teaching he only seemed to have a human body and that his physical existence, suffering, and death were illusions.
- Modern analogues: Christian science, gnostic-inspired spiritual movements
- Apollinarianism: denied Christ has a true human soul but instead has a divine mind and will.
- Division of Person (Against Ephesus)
- Nestorianism: Christ is two separate persons: the human Jesus and the divine Logos.
- Confusion or Collapse of Natures (Against Chalcedon)
- Monophysitism/Miaphysitism: Christ has one composite divine/human nature.
- Monothelitism: Christ had two natures but only one divine-human will.
Bonus
- Marcionism: rejected the Old Testament God as the Father of Christ (antithetical to Christ).
- Modern analogues: theological and secular liberalism.
- Nicene Creed
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Line |
Teaching |
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I believe in (Latin) /we believe in (Greek) |
“Believe” - not opinion but allegiance |
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One God, the Father Almighty |
“Father Almighty” - “ruler of all” |
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Maker of heaven and earth, and all things visible and invisible |
Maker of everything, rejecting gnosticism |
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And in one Lord Jesus Christ |
“One” - rejecting Nestorianism “Lord” - [ambiguous] biblical covenantal language first |
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The only begotten Son of God, begotten of the Father before all worlds |
“Son of God” - biblical but also ambiguous “only begotten” - monogenes - only child/only born “Before all worlds [or ages]” - eternal |
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God of God, Light of Light, very God of very God |
X (nature of Son) of (relation) X (source, i.e. Father) |
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Begotten, not made, being of one substance with the Father, by whom all things were made |
Rejecting Arianism: Son is not a creature but Creator “By whom all things were made” - inseparable operations |
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Who, for us men and our salvation, came down from heaven |
“Men” = humanity, not fallen angels (contra Origen) |
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And was incarnate by the Holy Spirit of the Virgin Mary, and was made man |
Literally incarnation; Holy Spirit, the Lord and Giver of Life |
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And was crucified also for us under Pontius Pilate, He suffered and was buried |
History, but missing a theory of the atonement |
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And the third day he rose again, according to the Scriptures |
Explicit here and shows implicit acceptance of the Scriptures throughout |
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He ascended into heaven and sits on the right hand of the Father |
Distinction between resurrection and ascension |
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and he shall come again, with glory, to judge the living and the dead; whose kingdom shall have no end. |
First was humble (nature) and saving (purpose) Second is glorious (nature) and judging (purpose) “Kingdom shall have no end” - added to reject view that incarnation was temporary |
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And we believe in the Holy Spirit, the Lord and Giver of life; |
Person and work of the Holy Spirit Affirming the full deity of the Spirit |
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who proceeds from the Father and the Son |
“And the Son” - Filioque, the major difference between Greek and Latin, East and West |
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who with the Father and the Son together is worshiped and glorified; who spoke by the prophets. |
Same divine honours “Prophets” - all Old Testament The Life Giver is also a Word Speaker |
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And we believe in one holy catholic and apostolic church. |
“One” - Jesus died for one bride “Holy” - set apart “Catholic” - universal, includes people from everywhere “Apostolic” - teaching of apostles |
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We acknowledge one baptism for the remission of sins; |
“Remission (or forgiveness) of sins” - Not baptismal regeneration but effective sign |
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and I look for the resurrection of the dead, and the life of the world to come. Amen. |
“Look for the resurrection of the dead” - very Christian specific hope that the Roman world mocked |
- Chalcedonian Definition
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Line |
Teaching |
|---|---|
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Following the teaching of the church fathers, we all with one voice confess one and the same Son, our Lord Jesus Christ |
This teaching is not novel but continues what the church has taught in proclaiming Christ |
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the same perfect in his divinity and perfect in his humanity, the same truly God and truly man, having a human soul and a human body; |
We deny Docetism, Apollinarianism, Monophysitism, Miaphysitism and any other teaching that doesn’t affirm Christ’s true divinity and humanity, with both full and distinct natures |
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of the same nature as the Father with respect to his divinity, and of the same nature as us with respect to his humanity; |
Nicene theology denying Arianism |
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like us in all respects except for sin; |
To be human is not necessarily to be sinful |
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eternally begotten from the Father with respect to his divinity, |
Denying Arianism |
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and born in the last days for us and for our salvation of the virgin Mary, who is rightly called the mother of God, with respect to his humanity; |
Denying Nestorianism |
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one and the same Christ, Son, Lord, only-begotten, recognized in two natures without confusion, without change, without division, without separation; at no point was the difference between the natures taken away through the union, but rather the distinct properties of each nature are preserved and come together in one person; |
“Without confusion, without change”: Denying Monophysitism/Miaphysitism, which blends/combines the natures “Without division, without separation”: Nestorianism, which splits Christ into two persons |
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he is not parted or divided into two persons, but is one and the same only-begotten Son, God, Word, Lord Jesus Christ. |
Denying Nestorianism |
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just as the prophets taught from the beginning about him, and as the Lord Jesus Christ himself instructed us, and as the creed of the church fathers has handed down to us. |
Continuity not just with the early church but from the beginning |
More in Sunday School: Doctrine of God
April 26, 2026
(Part 11 of 11) Conclusion: Knowing and Enjoying the Simple, Triune, Saving GodApril 12, 2026
(Part 9 of 11) The Trinity - Part 2 - How the Incarnation Changes A LotMarch 22, 2026
(Part 8 of 11) The Trinity - Part 1