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.
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But if the Son is said to be sent by the Father on this account, that the one is the Father, and the other the Son, this does not in any manner hinder us from believing the Son to be equal, and consubstantial, and co-eternal with the Father, and yet to have been sent as Son by the Father. Not because the one is greater, the other less; but because the one is Father, the other Son; the one begetter, the other begotten; the one, He from whom He is who is sent; the other, He who is from Him who sends. For the Son is from the Father, not the Father from the Son. And according to this manner we can now understand that the Son is not only said to have been sent because “the Word was made flesh,” but therefore sent that the Word might be made flesh, and that He might perform through His bodily presence those things which were written; that is, that not only is He understood to have been sent as man, which the Word was made but the Word, too, was sent that it might be made man; because He was not sent in respect to any inequality of power, or substance, or anything that in Him was not equal to the Father; but in respect to this, that the Son is from the Father, not the Father from the Son; for the Son is the Word of the Father, which is also called His wisdom. What wonder, therefore, if He is sent, not because He is unequal with the Father, but because He is “a pure emanation (manatio) issuing from the glory of the Almighty God?” For there, that which issues, and that from which it issues, is of one and the same substance. For it does not issue as water issues from an aperture of earth or of stone, but as light issues from light. For the words, “For she is the brightness of the everlasting light,” what else are they than, she is light of everlasting light? For what is the brightness of light, except light itself? and so co-eternal, with the light, from which the light is. But it is preferable to say, “the brightness of light,” rather than” the light of light;” lest that which issues should be thought to be darker than that from which it issues. For when one hears of the brightness of light as being light itself, it is more easy to believe that the former shines by means of the latter, than that the latter shines less. But because there was no need of warning men not to think that light to be less, which begat the other (for no heretic ever dared say this, neither is it to be believed that any one will dare to do so), Scripture meets that other thought, whereby that light which issues might seem darker than that from which it issues; and it has removed this surmise by saying, “It is the brightness of that light,” namely, of eternal light, and so shows it to be equal. For if it were less, then it would be its darkness, not its brightness; but if it were greater, then it could not issue from it, for it could not surpass that from which it is educed. Therefore, because it issues from it, it is not greater than it is; and because it is not its darkness, but its brightness, it is not less than it is: therefore it is equal. Nor ought this to trouble us, that it is called a pure emanation issuing from the glory of the Almighty God, as if itself were not omnipotent, but an emanation from the Omnipotent; for soon after it is said of it, “And being but one, she can do all things.” But who is omnipotent, unless He who can do all things? It is sent, therefore, by Him from whom it issues; for so she is sought after by him who loved and desired her. “Send her,” he says, “out of Thy holy heavens, and from the throne of Thy glory, that, being present, she may labor with me;” that is, may teach me to labor [heartily] in order that I may not labor [irksomely]. For her labors are virtues. But she is sent in one way that she may be with man; she has been sent in another way that she herself may be man. For, “entering into holy souls, she maketh them friends of God and prophets;” so she also fills the holy angels, and works all things fitting for such ministries by them. But when the fullness of time was come, she was sent, not to fill angels, nor to be an angel, except in so far as she announced the counsel of the Father, which was her own also; nor, again, to be with men or in men, for this too took place before, both in the fathers and in the prophets; but that the Word itself should be made flesh, that is, should be made man. In which future mystery, when revealed, was to be the salvation of those wise and holy men also, who, before He was born of the Virgin, were born of women; and in which, when done and made known, is the salvation of all who believe, and hope, and love. For this is “the great mystery of godliness, which was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.”
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Therefore the Word of God is sent by Him, of whom He is the Word; He is sent by Him, from whom He was begotten (genitum); He sends who begot, That is sent which is begotten. And He is then sent to each one, when He is apprehended and perceived by each, in so far as He can be apprehended and perceived, in proportion to the comprehension of the rational soul, either advancing towards God, or already perfect in God. The Son, therefore, is not properly said to have been sent in that He is begotten of the Father; but either in that the Word made flesh appeared to the world, whence He says, “I came forth from the Father, and am come into the world;” or in that from time to time, He is perceived by the mind of each, according to the saying, “Send her, that, being present with me, she may labor with me.” What then is born (natum) from eternity is eternal, “for it is the brightness of the everlasting light;” but what is sent from time to time, is that which is apprehended by each. But when the Son of God was made manifest in the flesh, He was sent into this world in the fullness of time, made of a woman. “For after that, in the wisdom of God, the world by wisdom knew not God” (since “the light shineth in darkness, and the darkness comprehended it not”), it “pleased God by the foolishness of preaching to save them that believe,” and that the Word should be made flesh, and dwell among us. But when from time to time He comes forth and is perceived by the mind of each, He is said indeed to be sent, but not into this world; for He does not appear sensibly, that is, He does not present Himself to the corporeal senses. For we ourselves, too, are not in this world, in respect to our grasping with the mind as far as we can that which is eternal; and the spirits of all the righteous are not in this world, even of those who are still living in the flesh, in so far as they have discernment in things divine. But the Father is not said to be sent, when from time to time He is apprehended by any one, for He has no one of whom to be, or from whom to proceed; since Wisdom says, “I came out of the mouth of the Most High,” and it is said of the Holy Spirit, “He proceedeth from the Father,” but the Father is from no one.
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As, therefore, the Father begat, the Son is begotten; so the Father sent, the Son was sent. But in like manner as He who begat and He who was begotten, so both He who sent and He who was sent, are one, since the Father and the Son are one. So also the Holy Spirit is one with them, since these three are one. For as to be born, in respect to the Son, means to be from the Father; so to be sent, in respect to the Son, means to be known to be from the Father. And as to be the gift of God in respect to the Holy Spirit, means to proceed from the Father; so to be sent, is to be known to proceed from the Father. Neither can we say that the Holy Spirit does not also proceed from the Son, for the same Spirit is not without reason said to be the Spirit both of the Father and of the Son. Nor do I see what else He intended to signify, when He breathed on the face of the disciples, and said, “Receive ye the Holy Ghost.” For that bodily breathing, proceeding from the body with the feeling of bodily touching, was not the substance of the Holy Spirit, but a declaration by a fitting sign, that the Holy Spirit proceeds not only from the Father, but also from the Son. For the veriest of madmen would not say, that it was one Spirit which He gave when He breathed on them, and another which He sent after His ascension. For the Spirit of God is one, the Spirit of the Father and of the Son, the Holy Spirit, who worketh all in all. But that He was given twice was certainly a significant economy, which we will discuss in its place, as far as the Lord may grant. That then which the Lord says,—“Whom I will send unto you from the Father,”—shows the Spirit to be both of the Father and of the Son; because, also, when He had said, “Whom the Father will send,” He added also, “in my name.” Yet He did not say, Whom the Father will send from me, as He said, “Whom I will send unto you from the Father,”—showing, namely, that the Father is the beginning (principium) of the whole divinity, or if it is better so expressed, deity. He, therefore, who proceeds from the Father and from the Son, is referred back to Him from whom the Son was born (natus). And that which the evangelist says, “For the Holy Ghost was not yet given, because that Jesus was not yet glorified;” how is this to be understood, unless because the special giving or sending of the Holy Spirit after the glorification of Christ was to be such as it had never been before? For it was not previously none at all, but it had not been such as this. For if the Holy Spirit was not given before, wherewith were the prophets who spoke filled? Whereas the Scripture plainly says, and shows in many places, that they spake by the Holy Spirit. Whereas, also, it is said of John the Baptist, “And he shall be filled with the Holy Ghost, even from his mother’s womb.” And his father Zacharias is found to have been filled with the Holy Ghost, so as to say such things of him. And Mary, too, was filled with the Holy Ghost, so as to foretell such things of the Lord, whom she was bearing in her womb. And Simeon and Anna were filled with the Holy Spirit, so as to acknowledge the greatness of the little child Christ. How, then, was “the Spirit not yet given, since Jesus was not yet glorified,” unless because that giving, or granting, or mission of the Holy Spirit was to have a certain speciality of its own in its very advent, such as never was before? For we read nowhere that men spoke in tongues which they did not know, through the Holy Spirit coming upon them; as happened then, when it was needful that His coming should be made plain by visible signs, in order to show that the whole world, and all nations constituted with different tongues, should believe in Christ through the gift of the Holy Spirit, to fulfill that which is sung in the Psalm, “There is no speech nor language where their voice is not heard; their sound is gone out through all the earth, and their words to the end of the world.”
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Therefore man was united, and in some sense commingled, with the Word of God, so as to be One Person, when the fullness of time was come, and the Son of God, made of a woman, was sent into this world, that He might be also the Son of man for the sake of the sons of men. And this person angelic nature could prefigure beforehand, so as to pre-announce, but could not appropriate, so as to be that person itself.