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.
Caput VII: We Conceive and Beget the Word Within, from the Things We Have Beheld in the Eternal Truth. The Word, Whether of the Creature or of the Creator, is Conceived by Love.
Caput VIII: In What Desire and Love Differ.
Caput IX: In the Love of Spiritual Things the Word Born is the Same as the Word Conceived. It is Otherwise in the Love of Carnal Things.
Caput X: Whether Only Knowledge that is Loved is the Word of the Mind.
Caput XI: That the Image or Begotten Word of the Mind that Knows Itself is Equal to the Mind Itself.
Caput XII: Why Love is Not the Offspring of the Mind, as Knowledge is So. The Solution of the Question. The Mind with the Knowledge of Itself and the Love of Itself is the Image of the Trinity.
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What then is love? Will it not be an image? Will it not be a word? Will it not be begotten? For why does the mind beget its knowledge when it knows itself, and not beget its love when it loves itself? For if it is the cause of its own knowing, for the reason that it is knowable, it is also the cause of its own love because it is lovable. It is hard, then, to say why it does not beget both. For there is a further question also respecting the supreme Trinity itself, the omnipotent God the Creator, after whose image man is made, which troubles men, whom the truth of God invites to the faith by human speech; viz. why the Holy Spirit is not also to be either believed or understood to be begotten by God the Father, so that He also may be called a Son. And this question we are endeavoring in some way to investigate in the human mind, in order that from a lower image, in which our own nature itself as it were answers, upon being questioned, in a way more familiar to ourselves, we may be able to direct a more practised mental vision from the enlightened creature to the unchangeable light; assuming, however, that the truth itself has persuaded us, that as no Christian doubts the Word of God to be the Son, so that the Holy Spirit is love. Let us return, then, to a more careful questioning and consideration upon this subject of that image which is the creature, that is, of the rational mind; wherein the knowledge of some things coming into existence in time, but which did not exist before, and the love of some things which were not loved before, opens to us more clearly what to say: because to speech also itself, which must be disposed in time, that thing is easier of explanation which is comprehended in the order of time.
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First, therefore, it is clear that a thing may possibly be knowable, that is, such as can be known, and yet that it may be unknown; but that it is not possible for that to be known which is not knowable. Wherefore it must be clearly held that everything whatsoever that we know begets at the same time in us the knowledge of itself; for knowledge is brought forth from both, from the knower and from the thing known. When, therefore, the mind knows itself, it alone is the parent of its own knowledge; for it is itself both the thing known and the knower of it. But it was knowable to itself also before it knew itself, only the knowledge of itself was not in itself so long as it did not know itself. In knowing itself, then, it begets a knowledge of itself equal to itself; since it does not know itself as less than itself is, nor is its knowledge the knowledge of the essence of some one else, not only because itself knows, but also because it knows itself, as we have said above. What then is to be said of love; why, when the mind loves itself, it should not seem also to have begotten the love of itself? For it was lovable to itself even before it loved itself since it could love itself; just as it was knowable to itself even before it knew itself, since it could know itself. For if it were not knowable to itself, it never could have known itself; and so, if it were not lovable to itself, it never could have loved itself. Why therefore may it not be said by loving itself to have begotten its own love, as by knowing itself it has begotten its own knowledge? Is it because it is thereby indeed plainly shown that this is the principle of love, whence it proceeds? for it proceeds from the mind itself, which is lovable to itself before it loves itself, and so is the principle of its own love by which it loves itself: but that this love is not therefore rightly said to be begotten by the mind, as is the knowledge of itself by which the mind knows itself, because in the case of knowledge the thing has been found already, which is what we call brought forth or discovered; and this is commonly preceded by an inquiry such as to find rest when that end is attained. For inquiry is the desire of finding, or, what is the same thing, of discovering. But those things which are discovered are as it were brought forth, whence they are like offspring; but wherein, except in the case itself of knowledge? For in that case they are as it were uttered and fashioned. For although the things existed already which we found by seeking, yet the knowledge of them did not exist, which knowledge we regard as an offspring that is born. Further, the desire (appetitus) which there is in seeking proceeds from him who seeks, and is in some way in suspense, and does not rest in the end whither it is directed, except that which is sought be found and conjoined with him who seeks. And this desire, that is, inquiry,—although it does not seem to be love, by which that which is known is loved, for in this case we are still striving to know,—yet it is something of the same kind. For it can be called will (voluntas), since every one who seeks wills (vult) to find; and if that is sought which belongs to knowledge, every one who seeks wills to know. But if he wills ardently and earnestly, he is said to study (studere): a word that is most commonly employed in the case of pursuing and obtaining any branches of learning. Therefore, the bringing forth of the mind is preceded by some desire, by which, through seeking and finding what we wish to know, the offspring, viz. knowledge itself, is born. And for this reason, that desire by which knowledge is conceived and brought forth, cannot rightly be called the bringing forth and the offspring; and the same desire which led us to long for the knowing of the thing, becomes the love of the thing when known, while it holds and embraces its accepted offspring, that is, knowledge, and unites it to its begetter. And so there is a kind of image of the Trinity in the mind itself, and the knowledge of it, which is its offspring and its word concerning itself, and love as a third, and these three are one, and one substance. Neither is the offspring less, since the mind knows itself according to the measure of its own being; nor is the love less, since it loves itself according to the measure both of its own knowledge and of its own being.