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.
Caput IV: How It Was Brought About that the Greeks Speak of Three Hypostases, the Latins of Three Persons. Scripture Nowhere Speaks of Three Persons in One God.
Caput V: In God, Substance is Spoken Improperly, Essence Properly.
Caput VI: Why We Do Not in the Trinity Speak of One Person, and Three Essences. What He Ought to Believe Concerning the Trinity Who Does Not Receive What is Said Above. Man is Both After the Image, and is the Image of God.
Book 8
Caput I: Preface.—The Conclusion of What Has Been Said Above. The Rule to Be Observed in the More Difficult Questions of the Faith.
Caput I: It is Shown by Reason that in God Three are Not Anything Greater Than One Person.
Caput II: Every Corporeal Conception Must Be Rejected, in Order that It May Be Understood How God is Truth.
Caput III: How God May Be Known to Be the Chief Good. The Mind Does Not Become Good Unless by Turning to God.
Caput IV: God Must First Be Known by an Unerring Faith, that He May Be Loved.
Caput V: How the Trinity May Be Loved Though Unknown.
Caput VI: How the Man Not Yet Righteous Can Know the Righteous Man Whom He Loves.
Caput VII: Of True Love, by Which We Arrive at the Knowledge of the Trinity. God is to Be Sought, Not Outwardly, by Seeking to Do Wonderful Things with the Angels, But Inwardly, by Imitating the Piety of Good Angels.
Caput VIII: That He Who Loves His Brother, Loves God; Because He Loves Love Itself, Which is of God, and is God.
- Let no one say, I do not know what I love. Let him love his brother, and he will love the same love. For he knows the love with which he loves, more than the brother whom he loves. So now he can know God more than he knows his brother: clearly known more, because more present; known more, because more within him; known more, because more certain. Embrace the love of God, and by love embrace God. That is love itself, which associates together all good angels and all the servants of God by the bond of sanctity, and joins together us and them mutually with ourselves, and joins us subordinately to Himself. In proportion, therefore, as we are healed from the swelling of pride, in such proportion are we more filled with love; and with what is he full, who is full of love, except with God? Well, but you will say, I see love, and, as far as I am able, I gaze upon it with my mind, and I believe the Scripture, saying, that “God is love; and he that dwelleth in love, dwelleth in God;” but when I see love, I do not see in it the Trinity. Nay, but thou dost see the Trinity if thou seest love. But if I can I will put you in mind, that thou mayest see that thou seest it; only let itself be present, that we may be moved by love to something good. Since, when we love love, we love one who loves something, and that on account of this very thing, that he does love something; therefore what does love love, that love itself also may be loved? For that is not love which loves nothing. But if it loves itself it must love something, that it may love itself as love. For as a word indicates something, and indicates also itself, but does not indicate itself to be a word, unless it indicates that it does indicate something; so love also loves indeed itself, but except it love itself as loving something, it loves itself not as love. What therefore does love love, except that which we love with love? But this, to begin from that which is nearest to us, is our brother. And listen how greatly the Apostle John commends brotherly love: “He that loveth his brother abideth in the light, and there is none occasion of stumbling in him.” It is manifest that he placed the perfection of righteousness in the love of our brother; for he certainly is perfect in whom “there is no occasion of stumbling.” And yet he seems to have passed by the love of God in silence; which he never would have done, unless because he intends God to be understood in brotherly love itself. For in this same epistle, a little further on, he says most plainly thus: “Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God. He that loveth not, knoweth not God; for God is love.” And this passage declares sufficiently and plainly, that this same brotherly love itself (for that is brotherly love by which we love each other) is set forth by so great authority, not only to be from God, but also to be God. When, therefore, we love our brother from love, we love our brother from God; neither can it be that we do not love above all else that same love by which we love our brother: whence it may be gathered that these two commandments cannot exist unless interchangeably. For since “God is love,” he who loves love certainly loves God; but he must needs love love, who loves his brother. And so a little after he says, “For he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen”? because the reason that he does not see God is, that he does not love his brother. For he who does not love his brother, abideth not in love; and he who abideth not in love, abideth not in God, because God is love. Further, he who abideth not in God, abideth not in light; for “God is light, and in Him is no darkness at all.” He therefore who abideth not in light, what wonder is it if he does not see light, that is, does not see God, because he is in darkness? But he sees his brother with human sight, with which God cannot be seen. But if he loved with spiritual love him whom he sees with human sight, he would see God, who is love itself, with the inner sight by which He can be seen. Therefore he who does not love his brother whom he sees, how can he love God, whom on that account he does not see, because God is love, which he has not who does not love his brother? Neither let that further question disturb us, how much of love we ought to spend upon our brother, and how much upon God: incomparably more upon God than upon ourselves, but upon our brother as much as upon ourselves; and we love ourselves so much the more, the more we love God. Therefore we love God and our neighbor from one and the same love; but we love God for the sake of God, and ourselves and our neighbors for the sake of God.