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.
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Let us now inquire more carefully, so far as God grants, into that which a little before we deferred; whether each person also in the Trinity can also by Himself and not with the other two be called God, or great, or wise, or true, or omnipotent, or just, or anything else that can be said of God, not relatively, but absolutely; or whether these things cannot be said except when the Trinity is understood. For the question is raised,—because it is written, “Christ the power of God, and the wisdom of God,”—whether He is so the Father of His own wisdom and His own power, as that He is wise with that wisdom which He begat, and powerful with that power which He begat; and whether, since He is always powerful and wise, He always begat power and wisdom. For if it be so, then, as we have said, why is He not also the Father of His own greatness by which He is great, and of His own goodness by which He is good, and of His own justice by which He is just, and whatever else there is? Or if all these things are understood, although under more names than one, to be in the same wisdom and power, so that that is greatness which is power, that is goodness which is wisdom, and that again is wisdom which is power, as we have already argued; then let us remember, that when I mention any one of these, I am to be taken as if I mentioned all. It is asked, then, whether the Father also by Himself is wise, and is Himself His own wisdom itself; or whether He is wise in the same way as He speaks. For He speaks by the Word which He begat, not by the word which is uttered, and sounds, and passes away, but by the Word which was with God, and the Word was God, and all things were made by Him: by the Word which is equal to Himself, by whom He always and unchangeably utters Himself. For He is not Himself the Word, as He is not the Son nor the image. But in speaking (putting aside those words of God in time which are produced in the creature, for they sound and pass away,—in speaking then) by that co-eternal Word, He is not understood singly, but with that Word itself, without whom certainly He does not speak. Is He then in such way wise as He is one who speaks, so as to be in such way wisdom, as He is the Word, and so that to be the Word is to be wisdom, that is, also to be power, so that power and wisdom and the Word may be the same, and be so called relatively as the Son and the image: and that the Father is not singly powerful or wise, but together with the power and wisdom itself which He begat (genuit); just as He is not singly one who speaks, but by that Word and together with that Word which He begat; and in like way great by that and together with that greatness, which He begat? And if He is not great by one thing, and God by another, but great by that whereby He is God, because it is not one thing to Him to be great and another to be God; it follows that neither is He God singly, but by that and together with that deity (deitas) which He begat; so that the Son is the deity of the Father, as He is the wisdom and power of the Father, and as He is the Word and image of the Father. And because it is not one thing to Him to be, another to be God, the Son is also the essence of the Father, as He is His Word and image. And hence also—except that He is the Father [the Unbegotten]—the Father is not anything unless because He has the Son; so that not only that which is meant by Father (which it is manifest He is not called relatively to Himself but to the Son, and therefore is the Father because He has the Son), but that which He is in respect to His own substance is so called, because He begat His own essence. For as He is great, only with that greatness which He begat, so also He is, only with that essence which He begat; because it is not one thing to Him to be, and another to be great. Is He therefore the Father of His own essence, in the same way as He is the Father of His own greatness, as He is the Father of His own power and wisdom? since His greatness is the same as His power, and His essence the same as His greatness.
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This discussion has arisen from that which is written, that “Christ is the power of God, and the wisdom of God.” Wherefore our discourse is compressed into these narrow limits, while we desire to speak things unspeakable; that either we must say that Christ is not the power of God and the wisdom of God, and so shamelessly and impiously resist the apostle; or we must acknowledge that Christ is indeed the power of God and the wisdom of God, but that His Father is not the Father of His own power and wisdom, which is not less impious; for so neither will He be the Father of Christ, because Christ is the power of God and the wisdom of God; or that the Father is not powerful with His own power, or wise with His own wisdom: and who shall dare to say this? Or yet, again, that we must understand, that in the Father it is one thing to be, another thing to be wise, so that He is not by that by which He is wise: a thing usually understood of the soul, which is at some times unwise, at others wise; as being by nature changeable, and not absolutely and perfectly simple. Or, again, that the Father is not anything in respect to His own substance; and that not only that He is the Father, but that He is, is said relatively to the Son. How then can the Son be of the same essence as the Father, seeing that the Father, in respect to Himself, is neither His own essence, nor is at all in respect to Himself, but even His essence is in relation to the Son? But, on the contrary, much more is He of one and the same essence, since the Father and Son are one and the same essence; seeing that the Father has His being itself not in respect to Himself, but to the Son, which essence He begat, and by which essence He is whatever He is. Therefore neither [person] is in respect to Himself alone; and both exist relatively the one to the other. Or is the Father alone not called Father of himself, but whatever He is called, is called relatively to the Son, but the Son is predicated of in reference to Himself? And if it be so, what is predicated of Him in reference to Himself? Is it His essence itself? But the Son is the essence of the Father, as He is the power and wisdom of the Father, as He is the Word of the Father, and the image of the Father. Or if the Son is called essence in reference to Himself, but the Father is not essence, but the begetter of the essence, and is not in respect to Himself, but is by that very essence which He begat; as He is great by that greatness which He begat: therefore the Son is also called greatness in respect to Himself; therefore He is also called, in like manner, power, and wisdom, and word, and image. But what can be more absurd than that He should be called image in respect to Himself? Or if image and word are not the very same with power and wisdom, but the former are spoken relatively, and the latter in respect to self, not to another; then we get to this, that the Father is not wise with that wisdom which He begat, because He Himself cannot be spoken relatively to it, and it cannot be spoken relatively to Him. For all things which are said relatively are said reciprocally; therefore it remains that even in essence the Son is spoken of relatively to the Father. But from this is educed a most unexpected sense: that essence itself is not essence, or at least that, when it is called essence, not essence but something relative is intimated. As when we speak of a master, essence is not intimated, but a relative which has reference to a slave; but when we speak of a man, or any such thing which is said in respect to self not to something else, then essence is intimated. Therefore when a man is called a master, man himself is essence, but he is called master relatively; for he is called man in respect to himself, but master in respect to his slave. But in regard to the point from which we started, if essence itself is spoken relatively, essence itself is not essence. Add further, that all essence which is spoken of relatively, is also something, although the relation be taken away; as e.g. in the case of a man who is a master, and a man who is a slave, and a horse that is a beast of burden, and money that is a pledge, the man, and the horse, and the money are spoken in respect to themselves, and are substances or essences; but master, and slave, and beast of burden, and pledge, are spoken relatively to something. But if there were not a man, that is, some substance, there would be none who could be called relatively a master; and if there were no horse having a certain essence, there would be nothing that could be called relatively a beast of burden; so if money were not some kind of substance, it could not be called relatively a pledge. Wherefore, if the Father also is not something in respect to Himself then there is no one at all that can be spoken of relatively to something. For it is not as it is with color. The color of a thing is referred to the thing colored, and color is not spoken at all in reference to substance, but is always of something that is colored; but that thing of which it is the color, even if it is referred to color in respect to its being colored, is yet, in respect to its being a body, spoken of in respect to substance. But in no way may we think, in like manner, that the Father cannot be called anything in respect to His own substance, but that whatever He is called, He is called in relation to the Son; while the same Son is spoken of both in respect to His own substance and in relation to the Father, when He is called great greatness, and powerful power, plainly in respect to Himself, and the greatness and power of the great and powerful Father, by which the Father is great and powerful. It is not so; but both are substance, and both are one substance. And as it is absurd to say that whiteness is not white, so is it absurd to say that wisdom is not wise; and as whiteness is called white in respect to itself, so also wisdom is called wise in respect to itself. But the whiteness of a body is not an essence, since the body itself is the essence, and that is a quality of it; and hence also a body is said from that quality to be white, to which body to be is not the same thing as to be white. For the form in it is one thing, and the color another; and both are not in themselves, but in a certain bulk, which bulk is neither form nor color, but is formed and colored. True wisdom is both wise, and wise in itself. And since in the case of every soul that becomes wise by partaking of wisdom, if it again becomes foolish, yet wisdom in itself remains; nor when that soul was changed into folly is the wisdom likewise so changed; therefore wisdom is not in him who becomes wise by it, in the same manner as whiteness is in the body which is by it made white. For when the body has been changed into another color, that whiteness will not remain, but will altogether cease to be. But if the Father who begat wisdom is also made wise by it, and to be is not to Him the same as to be wise, then the Son is His quality, not His offspring; and there will no longer be absolute simplicity in the Godhead. But far be it from being so, since in truth in the Godhead is absolutely simple essence, and therefore to be is there the same as to be wise. But if to be is there the same as to be wise, then the Father is not wise by that wisdom which He begat; otherwise He did not beget it, but it begat Him. For what else do we say when we say, that to Him to be is the same as to be wise, unless that He is by that whereby He is wise? Wherefore, that which is the cause to Him of being wise, is itself also the cause to Him that He is; and accordingly, if the wisdom which He begat is the cause to Him of being wise, it is also the cause to Him that He is; and this cannot be the case, except either by begetting or by creating Him. But no one ever said in any sense that wisdom is either the begetter or the creator of the Father; for what could be more senseless? Therefore both the Father Himself is wisdom, and the Son is in such way called the wisdom of the Father, as He is called the light of the Father; that is, that in the same manner as light from light, and yet both one light, so we are to understand wisdom of wisdom, and yet both one wisdom; and therefore also one essence, since, in God, to be, is the same as to be wise. For what to be wise is to wisdom, and to be able is to power, and to be eternal is to eternity, and to be just to justice, and to be great to greatness, that being itself is to essence. And since in the Divine simplicity, to be wise is nothing else than to be, therefore wisdom there is the same as essence.