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.
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Behold again, and see if thou canst. Thou certainly dost not love anything except what is good, since good is the earth, with the loftiness of its mountains, and the due measure of its hills, and the level surface of its plains; and good is an estate that is pleasant and fertile; and good is a house that is arranged in due proportions, and is spacious and bright; and good are animal and animate bodies; and good is air that is temperate, and salubrious; and good is food that is agreeable and fit for health; and good is health, without pains or lassitude; and good is the countenance of man that is disposed in fit proportions, and is cheerful in look, and bright in color; and good is the mind of a friend, with the sweetness of agreement, and with the confidence of love; and good is a righteous man; and good are riches, since they are readily useful; and good is the heaven, with its sun, and moon, and stars; and good are the angels, by their holy obedience; and good is discourse that sweetly teaches and suitably admonishes the hearer; and good is a poem that is harmonious in its numbers and weighty in its sense. And why add yet more and more? This thing is good and that good, but take away this and that, and regard good itself if thou canst; so wilt thou see God, not good by a good that is other than Himself, but the good of all good. For in all these good things, whether those which I have mentioned, or any else that are to be discerned or thought, we could not say that one was better than another, when we judge truly, unless a conception of the good itself had been impressed upon us, such that according to it we might both approve some things as good, and prefer one good to another. So God is to be loved, not this and that good, but the good itself. For the good that must be sought for the soul is not one above which it is to fly by judging, but to which it is to cleave by loving; and what can this be except God? Not a good mind, or a good angel, or the good heaven, but the good good. For perhaps what I wish to say may be more easily perceived in this way. For when, for instance, a mind is called good, as there are two words, so from these words I understand two things—one whereby it is mind, and another whereby it is good. And itself had no share in making itself a mind, for there was nothing as yet to make itself to be anything; but to make itself to be a good mind, I see, must be brought about by the will: not because that by which it is mind is not itself anything good;—for how else is it already called, and most truly called, better than the body?—but it is not yet called a good mind, for this reason, that the action of the will still is wanted, by which it is to become more excellent; and if it has neglected this, then it is justly blamed, and is rightly called not a good mind. For it then differs from the mind which does perform this; and since the latter is praiseworthy, the former doubtless, which does not perform, it is blameable. But when it does this of set purpose, and becomes a good mind, it yet cannot attain to being so unless it turn itself to something which itself is not. And to what can it turn itself that it may become a good mind, except to the good which it loves, and seeks, and obtains? And if it turns itself back again from this, and becomes not good, then by the very act of turning away from the good, unless that good remain in it from which it turns away, it cannot again turn itself back thither if it should wish to amend.
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Wherefore there would be no changeable goods, unless there were the unchangeable good. Whenever then thou art told of this good thing and that good thing, which things can also in other respects be called not good, if thou canst put aside those things which are good by the participation of the good, and discern that good itself by the participation of which they are good (for when this or that good thing is spoken of, thou understandest together with them the good itself also): if, then, I say thou canst remove these things, and canst discern the good in itself, then thou wilt have discerned God. And if thou shalt cleave to Him with love, thou shalt be forthwith blessed. But whereas other things are not loved, except because they are good, be ashamed, in cleaving to them, not to love the good itself whence they are good. That also, which is a mind, only because it is a mind, while it is not yet also good by the turning itself to the unchangeable good, but, as I said, is only a mind; whenever it so pleases us, as that we prefer it even, if we understand aright, to all corporeal light, does not please us in itself, but in that skill by which it was made. For it is thence approved as made, wherein it is seen to have been to be made. This is truth, and simple good: for it is nothing else than the good itself, and for this reason also the chief good. For no good can be diminished or increased, except that which is good from some other good. Therefore the mind turns itself, in order to be good, to that by which it comes to be a mind. Therefore the will is then in harmony with nature, so that the mind may be perfected in good, when that good is loved by the turning of the will to it, whence that other good also comes which is not lost by the turning away of the will from it. For by turning itself from the chief good, the mind loses the being a good mind; but it does not lose the being a mind. And this, too, is a good already, and one better than the body. The will, therefore, loses that which the will obtains. For the mind already was, that could wish to be turned to that from which it was: but that as yet was not, that could wish to be before it was. And herein is our [supreme] good, when we see whether the thing ought to be or to have been, respecting which we comprehend that it ought to be or to have been, and when we see that the thing could not have been unless it ought to have been, of which we also do not comprehend in what manner it ought to have been. This good then is not far from every one of us: for in it we live, and move, and have our being.