On the Trinity
Augustine of Hippo (354–430)
First published 428
Augustine's De Trinitate, staged here in the public-domain NPNF English translation by Arthur West Haddan, revised by W. G. T. Shedd.
Book 1
Caput I: This Work is Written Against Those Who Sophistically Assail the Faith of the Trinity, Through Misuse of Reason. They Who Dispute Concerning God Err from a Threefold Cause. Holy Scripture, Removing What is False, Leads Us on by Degrees to Things Divine. What True Immortality is. We are Nourished by Faith, that We May Be Enabled to Apprehend Things Divine.
Caput II: In What Manner This Work Proposes to Discourse Concerning the Trinity.
Caput III: What Augustin Requests from His Readers. The Errors of Readers Dull of Comprehension Not to Be Ascribed to the Author.
Caput IV: What the Doctrine of the Catholic Faith is Concerning the Trinity.
Caput V: Of Difficulties Concerning the Trinity: in What Manner Three are One God, and How, Working Indivisibly, They Yet Perform Some Things Severally.
Caput VI: That the Son is Very God, of the Same Substance with the Father. Not Only the Father, But the Trinity, is Affirmed to Be Immortal. All Things are Not from the Father Alone, But Also from the Son. That the Holy Spirit is Very God, Equal with the Father and the Son.
Caput VII: In What Manner the Son is Less Than the Father, and Than Himself.
Caput VIII: The Texts of Scripture Explained Respecting the Subjection of the Son to the Father, Which Have Been Misunderstood. Christ Will Not So Give Up the Kingdom to the Father, as to Take It Away from Himself. The Beholding Him is the Promised End of All Actions. The Holy Spirit is Sufficient to Our Blessedness Equally with the Father.
Caput IX: All are Sometimes Understood in One Person.
Caput X: In What Manner Christ Shall Deliver Up the Kingdom to God, Even the Father. The Kingdom Having Been Delivered to God, Even the Father, Christ Will Not Then Make Intercession for Us.
Caput XI: By What Rule in the Scriptures It is Understood that the Son is Now Equal and Now Less.
Caput XII: In What Manner the Son is Said Not to Know the Day and the Hour Which the Father Knows. Some Things Said of Christ According to the Form of God, Other Things According to the Form of a Servant. In What Way It is of Christ to Give the Kingdom, in What Not of Christ. Christ Will Both Judge and Not Judge.
Caput XIII: Diverse Things are Spoken Concerning the Same Christ, on Account of the Diverse Natures of the One Hypostasis [Theanthropic Person]. Why It is Said that the Father Will Not Judge, But Has Given Judgment to the Son.
Book 2
Caput I: Preface
Caput I: There is a Double Rule for Understanding the Scriptural Modes of Speech Concerning the Son of God. These Modes of Speech are of a Threefold Kind.
Caput II: That Some Ways of Speaking Concerning the Son are to Be Understood According to Either Rule.
Caput III: Some Things Concerning the Holy Spirit are to Be Understood According to the One Rule Only.
Caput IV: The Glorification of the Son by the Father Does Not Prove Inequality.
Caput V: The Son and Holy Spirit are Not Therefore Less Because Sent. The Son is Sent Also by Himself. Of the Sending of the Holy Spirit.
Caput VI: The Creature is Not So Taken by the Holy Spirit as Flesh is by the Word.
Caput VII: A Doubt Raised About Divine Appearances.
Caput VIII: The Entire Trinity Invisible.
Caput IX: Against Those Who Believed the Father Only to Be Immortal and Invisible. The Truth to Be Sought by Peaceful Study.
Caput X: Whether God the Trinity Indiscriminately Appeared to the Fathers, or Any One Person of the Trinity. The Appearing of God to Adam. Of the Same Appearance. The Vision to Abraham.
Caput XI: Of the Same Appearance.
Caput XII: The Appearance to Lot is Examined.
Caput XIII: The Appearance in the Bush.
Caput XIV: Of the Appearance in the Pillar of Cloud and of Fire.
Caput XV: Of the Appearance on Sinai. Whether the Trinity Spake in that Appearance or Some One Person Specially.
Caput XVI: In What Manner Moses Saw God.
Caput XVII: How the Back Parts of God Were Seen. The Faith of the Resurrection of Christ. The Catholic Church Only is the Place from Whence the Back Parts of God are Seen. The Back Parts of God Were Seen by the Israelites. It is a Rash Opinion to Think that God the Father Only Was Never Seen by the Fathers.
Caput XVIII: The Vision of Daniel.
Book 3
Caput I: Preface
Caput I: What is to Be Said Thereupon.
Caput II: The Will of God is the Higher Cause of All Corporeal Change. This is Shown by an Example.
Caput III: Of the Same Argument.
Caput IV: God Uses All Creatures as He Will, and Makes Visible Things for the Manifestation of Himself.
Caput V: Why Miracles are Not Usual Works.
Caput VI: Diversity Alone Makes a Miracle.
Caput VII: Great Miracles Wrought by Magic Arts.
Caput VIII: God Alone Creates Those Things Which are Changed by Magic Art.
Caput IX: The Original Cause of All Things is from God.
Caput X: In How Many Ways the Creature is to Be Taken by Way of Sign. The Eucharist.
Caput XI: The Essence of God Never Appeared in Itself. Divine Appearances to the Fathers Wrought by the Ministry of Angels. An Objection Drawn from the Mode of Speech Removed. That the Appearing of God to Abraham Himself, Just as that to Moses, Was Wrought by Angels. The Same Thing is Proved by the Law Being Given to Moses by Angels. What Has Been Said in This Book, and What Remains to Be Said in the Next.
Book 4
Caput I: Preface
Caput I: We are Made Perfect by Acknowledgement of Our Own Weakness. The Incarnate Word Dispels Our Darkness.
Caput II: How We are Rendered Apt for the Perception of Truth Through the Incarnate Word.
Caput III: The One Death and Resurrection of The Body of Christ Harmonizes with Our Double Death and Resurrection of Body and Soul, to the Effect of Salvation. In What Way the Single Death of Christ is Bestowed Upon Our Double Death.
Caput IV: The Ratio of the Single to the Double Comes from the Perfection of the Senary Number. The Perfection of The Senary Number is Commended in the Scriptures. The Year Abounds in The Senary Number.
Caput V: The Number Six is Also Commended in the Building Up of the Body of Christ and of the Temple at Jerusalem.
Caput VI: The Three Days of the Resurrection, in Which Also the Ratio of Single to Double is Apparent.
Caput VII: In What Manner We are Gathered from Many into One Through One Mediator.
Caput VIII: In What Manner Christ Wills that All Shall Be One in Himself.
Caput IX: The Same Argument Continued.
Caput X: As Christ is the Mediator of Life, So the Devil is the Mediator of Death.
Caput XI: Miracles Which are Done by Demons are to Be Spurned.
Caput XII: The Devil the Mediator of Death, Christ of Life.
Caput XIII: The Death of Christ Voluntary. How the Mediator of Life Subdued the Mediator of Death. How the Devil Leads His Own to Despise the Death of Christ.
Caput XIV: Christ the Most Perfect Victim for Cleansing Our Faults. In Every Sacrifice Four Things are to Be Considered.
Caput XV: They are Proud Who Think They are Able, by Their Own Righteousness, to Be Cleansed So as to See God.
Caput XVI: The Old Philosophers are Not to Be Consulted Concerning the Resurrection and Concerning Things to Come.
Caput XVII: In How Many Ways Things Future are Foreknown. Neither Philosophers, Nor Those Who Were Distinguished Among the Ancients, are to Be Consulted Concerning the Resurrection of the Dead.
Caput XVIII: The Son of God Became Incarnate in Order that We Being Cleansed by Faith May Be Raised to the Unchangeable Truth.
Caput XIX: In What Manner the Son Was Sent and Proclaimed Beforehand. How in the Sending of His Birth in the Flesh He Was Made Less Without Detriment to His Equality with the Father.
Caput XX: The Sender and the Sent Equal. Why the Son is Said to Be Sent by the Father. Of the Mission of the Holy Spirit. How and by Whom He Was Sent. The Father the Beginning of the Whole Godhead.
Caput XXI: Of the Sensible Showing of the Holy Spirit, and of the Coeternity of the Trinity. What Has Been Said, and What Remains to Be Said.
Book 5
Caput I: What the Author Entreats from God, What from the Reader. In God Nothing is to Be Thought Corporeal or Changeable.
Caput II: God the Only Unchangeable Essence.
Caput III: The Argument of the Arians is Refuted, Which is Drawn from the Words Begotten and Unbegotten.
Caput IV: The Accidental Always Implies Some Change in the Thing.
Caput V: Nothing is Spoken of God According to Accident, But According to Substance or According to Relation.
Caput VI: Reply is Made to the Cavils of the Heretics in Respect to the Same Words Begotten and Unbegotten.
Caput VII: The Addition of a Negative Does Not Change the Predicament.
Caput VIII: Whatever is Spoken of God According to Substance, is Spoken of Each Person Severally, and Together of the Trinity Itself. One Essence in God, and Three, in Greek, Hypostases, in Latin, Persons.
Caput IX: The Three Persons Not Properly So Called [in a Human Sense].
Caput X: Those Things Which Belong Absolutely to God as an Essence, are Spoken of the Trinity in the Singular, Not in the Plural.
Caput XI: What is Said Relatively in the Trinity.
Caput XII: In Relative Things that are Reciprocal, Names are Sometimes Wanting.
Caput XIII: How the Word Beginning (Principium) is Spoken Relatively in the Trinity.
Caput XIV: The Father and the Son the Only Beginning (Principium) of the Holy Spirit.
Caput XV: Whether the Holy Spirit Was a Gift Before as Well as After He Was Given.
Caput XVI: What is Said of God in Time, is Said Relatively, Not Accidentally.
Book 6
Caput I: The Son, According to the Apostle, is the Power and Wisdom of the Father. Hence the Reasoning of the Catholics Against the Earlier Arians. A Difficulty is Raised, Whether the Father is Not Wisdom Himself, But Only the Father of Wisdom.
Caput II: What is Said of the Father and Son Together, and What Not.
Caput III: That the Unity of the Essence of the Father and the Son is to Be Gathered from the Words, ‘We are One.’ The Son is Equal to the Father Both in Wisdom and in All Other Things.
Caput IV: The Same Argument Continued.
Caput V: The Holy Spirit Also is Equal to the Father and the Son in All Things.
Caput VI: How God is a Substance Both Simple and Manifold.
Caput VII: God is a Trinity, But Not Triple (Triplex).
Caput VIII: No Addition Can Be Made to the Nature of God.
Caput IX: Whether One or the Three Persons Together are Called the Only God.
Caput X: Of the Attributes Assigned by Hilary to Each Person. The Trinity is Represented in Things that are Made.
Book 7
Caput I: Augustin Returns to the Question, Whether Each Person of the Trinity by Itself is Wisdom. With What Difficulty, or in What Way, the Proposed Question is to Be Solved.
Caput II: The Father and the Son are Together One Wisdom, as One Essence, Although Not Together One Word.
Caput III: Why the Son Chiefly is Intimated in the Scriptures by the Name of Wisdom, While Both the Father and the Holy Spirit are Wisdom. That the Holy Spirit, Together with the Father and the Son, is One Wisdom.
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Why, then, is scarcely anything ever said in the Scriptures of wisdom, unless to show that it is begotten or created of God?—begotten in the case of that Wisdom by which all things are made; but created or made, as in men, when they are converted to that Wisdom which is not created and made but begotten, and are so enlightened; for in these men themselves there comes to be something which may be called their wisdom: even as the Scriptures foretell or narrate, that “the Word was made flesh, and dwelt among us;” for in this way Christ was made wisdom, because He was made man. Is it on this account that wisdom does not speak in these books, nor is anything spoken of it, except to declare that it is born of God, or made by Him (although the Father is Himself wisdom), namely, because wisdom ought to be commended and imitated by us, by the imitation of which we are fashioned [rightly]? For the Father speaks it, that it may be His Word: yet not as a word producing a sound proceeds from the mouth, or is thought before it is pronounced. For this word is completed in certain spaces of time, but that is eternal, and speaks to us by enlightening us, what ought to be spoken to men, both of itself and of the Father. And therefore He says, “No man knoweth the Son, but the Father; neither knoweth any man the Father, save the Son, and he to whomsoever the Son will reveal Him:” since the Father reveals by the Son, that is, by His Word. For if that word which we utter, and which is temporal and transitory, declares both itself, and that of which we speak, how much more the Word of God, by which all things are made? For this Word so declares the Father as He is the Father; because both itself so is, and is that which is the Father, in so far as it is wisdom and essence. For in so far as it is the Word, it is not what the Father is; because the Word is not the Father, and Word is spoken relatively, as is also Son, which assuredly is not the Father. And therefore Christ is the power and wisdom of God, because He Himself, being also power and wisdom, is from the Father, who is power and wisdom; as He is light of the Father, who is light, and the fountain of life with God the Father, who is Himself assuredly the fountain of life. For “with Thee,” He says, “is the fountain of life, and in Thy light shall we see light.” Because, “as the Father hath life in Himself, so hath He given to the Son to have life in Himself:” and, “He was the true Light, which lighteth every man that cometh into the world:” and this light, “the Word,” was “with God;” but “the Word also was God;” and “God is light, and in Him is no darkness at all:” but a light that is not corporeal, but spiritual; yet not in such way spiritual, that it was wrought by illumination, as it was said to the apostles, “Ye are the light of the world,” but “the light which lighteth every man,” that very supreme wisdom itself who is God, of whom we now treat. The Son therefore is Wisdom of wisdom, namely the Father, as He is Light of light, and God of God; so that both the Father singly is light, and the Son singly is light; and the Father singly is God, and the Son singly is God: therefore the Father also singly is wisdom, and the Son singly is wisdom. And as both together are one light and one God, so both are one wisdom. But the Son is “by God made unto us wisdom, and righteousness, and sanctification;” because we turn ourselves to Him in time, that is, from some particular time, that we may remain with Him for ever. And He Himself from a certain time was “the Word made flesh, and dwelt among us.”
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On this account, then, when anything concerning wisdom is declared or narrated in the Scriptures, whether as itself speaking, or where anything is spoken of it, the Son chiefly is intimated to us. And by the example of Him who is the image, let us also not depart from God, since we also are the Image of God: not indeed that which is equal to Him, since we are made so by the Father through the Son, and not born of the Father, as that is. And we are so, because we are enlightened with light; but that is so, because it is the light that enlightens; and which, therefore, being without pattern, is to us a pattern. For He does not imitate any one going before Him, in respect to the Father, from whom He is never separable at all, since He is the very same substance with Him from whom He is. But we by striving imitate Him who abides, and follow Him who stands still, and walking in Him, reach out towards Him; because He is made for us a way in time by His humiliation, which is to us an eternal abiding-place by His divinity. For since to pure intellectual spirits, who have not fallen through pride, He gives an example in the form of God and as equal with God and as God; so, in order that He might also give Himself as an example of returning to fallen man who on account of the uncleanness of sins and the punishment of mortality cannot see God, “He emptied Himself;” not by changing His own divinity, but by assuming our changeableness: and “taking upon Him the form of a servant” He came to us into this world,” who “was in this world,” because “the world was made by Him;” that He might be an example upwards to those who see God, an example downwards to those who admire man, an example to the sound to persevere, an example to the sick to be made whole, an example to those who are to die that they may not fear, an example to the dead that they may rise again, “that in all things He might have the pre-eminence.” So that, because man ought not to follow any except God to blessedness, and yet cannot perceive God; by following God made man, he might follow at once Him whom he could perceive, and whom he ought to follow. Let us then love Him and cleave to Him, by charity spread abroad in our hearts, through the Holy Spirit which is given unto us. It is not therefore to be wondered at, if, on account of the example which the Image, which is equal to the Father, gives to us, in order that we may be refashioned after the image of God, Scripture, when it speaks of wisdom, speaks of the Son, whom we follow by living wisely; although the Father also is wisdom, as He is both light and God.
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The Holy Spirit also, whether we are to call Him that absolute love which joins together Father and Son, and joins us also from beneath, that so that is not unfitly said which is written, “God is love;” how is He not also Himself wisdom, since He is light, because “God is light”? or whether after any other way the essence of the Holy Spirit is to be singly and properly named; then, too, since He is God, He is certainly light; and since He is light, He is certainly wisdom. But that the Holy Spirit is God, Scripture proclaims by the apostle, who says, “Know ye not that ye are the temple of God?” and immediately subjoins, “And the Spirit of God dwelleth in you;” for God dwelleth in His own temple. For the Spirit of God does not dwell in the temple of God as a servant, since he says more plainly in another place, “Know ye not that your body is the temple of the Holy Ghost which is in you, and which ye have of God, and ye are not your own? For ye are bought with a great price: therefore glorify God in your body.” But what is wisdom, except spiritual and unchangeable light? For yonder sun also is light, but it is corporeal; and the spiritual creature also is light, but it is not unchangeable. Therefore the Father is light, the Son is light, and the Holy Spirit is light; but together not three lights, but one light. And so the Father is wisdom, the Son is wisdom, and the Holy Spirit is wisdom, and together not three wisdoms, but one wisdom: and because in the Trinity to be is the same as to be wise, the Father, Son, and Holy Spirit, are one essence. Neither in the Trinity is it one thing to be and another to be God; therefore the Father, Son, and Holy Spirit, are one God.