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.
Caput IX: Our Love of the Righteous is Kindled from Love Itself of the Unchangeable Form of Righteousness.
Caput X: There are Three Things in Love, as It Were a Trace of the Trinity.
Book 9
Caput I: In What Way We Must Inquire Concerning the Trinity.
Caput II: The Three Things Which are Found in Love Must Be Considered.
Caput III: The Image of the Trinity in the Mind of Man Who Knows Himself and Loves Himself. The Mind Knows Itself Through Itself.
Caput IV: The Three are One, and Also Equal, Viz. The Mind Itself, and the Love, and the Knowledge of It. That the Same Three Exist Substantially, and are Predicated Relatively. That the Same Three are Inseparable. That the Same Three are Not Joined and Commingled Like Parts, But that They are of One Essence, and are Relatives.
Caput V: That These Three are Several in Themselves, and Mutually All in All.
Caput VI: There is One Knowledge of the Thing in the Thing Itself, and Another in Eternal Truth Itself. That Corporeal Things, Too, are to Be Judged the Rules of Eternal Truth.
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But when the human mind knows itself and loves itself, it does not know and love anything unchangeable: and each individual man declares his own particular mind by one manner of speech, when he considers what takes place in himself; but defines the human mind abstractly by special or general knowledge. And so, when he speaks to me of his own individual mind, as to whether he understands this or that, or does not understand it, or whether he wishes or does not wish this or that, I believe; but when he speaks the truth of the mind of man generally or specially, I recognize and approve. Whence it is manifest, that each sees a thing in himself, in such way that another person may believe what he says of it, yet may not see it; but another [sees a thing] in the truth itself, in such way that another person also can gaze upon it; of which the former undergoes changes at successive times, the latter consists in an unchangeable eternity. For we do not gather a generic or specific knowledge of the human mind by means of resemblance by seeing many minds with the eyes of the body: but we gaze upon indestructible truth, from which to define perfectly, as far as we can, not of what sort is the mind of any one particular man, but of what sort it ought to be upon the eternal plan.
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Whence also, even in the case of the images of things corporeal which are drawn in through the bodily sense, and in some way infused into the memory, from which also those things which have not been seen are thought under a fancied image, whether otherwise than they really are, or even perchance as they are;—even here too, we are proved either to accept or reject, within ourselves, by other rules which remain altogether unchangeable above our mind, when we approve or reject anything rightly. For both when I recall the walls of Carthage which I have seen, and imagine to myself the walls of Alexandria which I have not seen, and, in preferring this to that among forms which in both cases are imaginary, make that preference upon grounds of reason; the judgment of truth from above is still strong and clear, and rests firmly upon the utterly indestructible rules of its own right; and if it is covered as it were by cloudiness of corporeal images, yet is not wrapt up and confounded in them.
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But it makes a difference, whether, under that or in that darkness, I am shut off as it were from the clear heaven; or whether (as usually happens on lofty mountains), enjoying the free air between both, I at once look up above to the calmest light, and down below upon the densest clouds. For whence is the ardor of brotherly love kindled in me, when I hear that some man has borne bitter torments for the excellence and steadfastness of faith? And if that man is shown to me with the finger, I am eager to join myself to him, to become acquainted with him, to bind him to myself in friendship. And accordingly, if opportunity offers, I draw near, I address him, I converse with him, I express my goodwill towards him in what words I can, and wish that in him too in turn should be brought to pass and expressed goodwill towards me; and I endeavor after a spiritual embrace in the way of belief, since I cannot search out so quickly and discern altogether his innermost heart. I love therefore the faithful and courageous man with a pure and genuine love. But if he were to confess to me in the course of conversation, or were through unguardedness to show in any way, that either he believes something unseemly of God, and desires also something carnal in Him, and that he bore these torments on behalf of such an error, or from the desire of money for which he hoped, or from empty greediness of human praise: immediately it follows that the love with which I was borne towards him, displeased, and as it were repelled, and taken away from an unworthy man, remains in that form, after which, believing him such as I did, I had loved him; unless perhaps I have come to love him to this end, that he may become such, while I have found him not to be such in fact. And in that man, too, nothing is changed: although it can be changed, so that he may become that which I had believed him to be already. But in my mind there certainly is something changed, viz., the estimate I had formed of him, which was before of one sort, and now is of another: and the same love, at the bidding from above of unchangeable righteousness, is turned aside from the purpose of enjoying, to the purpose of taking counsel. But the form itself of unshaken and stable truth, wherein I should have enjoyed the fruition of the man, believing him to be good, and wherein likewise I take counsel that he may be good, sheds in an immoveable eternity the same light of incorruptible and most sound reason, both upon the sight of my mind, and upon that cloud of images, which I discern from above, when I think of the same man whom I had seen. Again, when I call back to my mind some arch, turned beautifully and symmetrically, which, let us say, I saw at Carthage; a certain reality that had been made known to the mind through the eyes, and transferred to the memory, causes the imaginary view. But I behold in my mind yet another thing, according to which that work of art pleases me; and whence also, if it displeased me, I should correct it. We judge therefore of those particular things according to that [form of eternal truth], and discern that form by the intuition of the rational mind. But those things themselves we either touch if present by the bodily sense, or if absent remember their images as fixed in our memory, or picture, in the way of likeness to them, such things as we ourselves also, if we wished and were able, would laboriously build up: figuring in the mind after one fashion the images of bodies, or seeing bodies through the body; but after another, grasping by simple intelligence what is above the eye of the mind, viz., the reasons and the unspeakably beautiful skill of such forms.