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.
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But for our present need we must discuss, so far as God gives us power, in what manner the single of our Lord and Saviour Jesus Christ answers to, and is, so to say, in harmony with our double to the effect of salvation. We certainly, as no Christian doubts, are dead both in soul and body: in soul, because of sin; in body, because of the punishment of sin, and through this also in body because of sin. And to both these parts of ourselves, that is, both to soul and to body, there was need both of a medicine and of resurrection, that what had been changed for the worse might be renewed for the better. Now the death of the soul is ungodliness, and the death of the body is corruptibility, through which comes also a departure of the soul from the body. For as the soul dies when God leaves it, so the body dies when the soul leaves it; whereby the former becomes foolish, the latter lifeless. For the soul is raised up again by repentance, and the renewing of life is begun in the body still mortal by faith, by which men believe on Him who justifies the ungodly; and it is increased and strengthened by good habits from day to day, as the inner man is renewed more and more. But the body, being as it were the outward man, the longer this life lasts is so much the more corrupted, either by age or by disease, or by various afflictions, until it come to that last affliction which all call death. And its resurrection is delayed until the end; when also our justification itself shall be perfected ineffably. For then we shall be like Him, for we shall see Him as He is. But now, so long as the corruptible body presseth down the soul, and human life upon earth is all temptation, in His sight shall no man living be justified, in comparison of the righteousness in which we shall be made equal with the angels, and of the glory which shall be revealed in us. But why mention more proofs respecting the difference between the death of the soul and the death of the body, when the Lord in one sentence of the Gospel has made either death easily distinguishable by any one from the other, where He says, “Let the dead bury their dead”? For burial was the fitting disposal of a dead body. But by those who were to bury it He meant those who were dead in soul by the impiety of unbelief, such, namely, as are awakened when it is said, “Awake thou that sleepest, and arise from the dead, and Christ shall give thee light.” And there is a death which the apostle denounces, saying of the widow, “But she that liveth in pleasure is dead while she liveth.” Therefore the soul, which was before ungodly and is now godly, is said to have come alive again from the dead and to live, on account of the righteousness of faith. But the body is not only said to be about to die, on account of that departure of the soul which will be; but on account of the great infirmity of flesh and blood it is even said to be now dead, in a certain place in the Scriptures, namely, where the apostle says, that “the body is dead because of sin, but the spirit is life because of righteousness.” Now this life is wrought by faith, “since the just shall live by faith.” But what follows? “But if the spirit of Him that raised up Jesus from the dead dwell in you, He that raised up Christ from the dead shall also quicken your mortal bodies by His Spirit which dwelleth in you.”
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Therefore on this double death of ours our Saviour bestowed His own single death; and to cause both our resurrections, He appointed beforehand and set forth in mystery and type His own one resurrection. For He was not a sinner or ungodly, that, as though dead in spirit, He should need to be renewed in the inner man, and to be recalled as it were to the life of righteousness by repentance; but being clothed in mortal flesh, and in that alone dying, in that alone rising again, in that alone did He answer to both for us; since in it was wrought a mystery as regards the inner man, and a type as regards the outer. For it was in a mystery as regards our inner man, so as to signify the death of our soul, that those words were uttered, not only in the Psalm, but also on the cross: “My God, my God, why hast Thou forsaken me?” To which words the apostle agrees, saying, “Knowing this, that our old man is crucified with Him, that the body of sin might be destroyed, that henceforth we should not serve sin;” since by the crucifixion of the inner man are understood the pains of repentance, and a certain wholesome agony of self-control, by which death the death of ungodliness is destroyed, and in which death God has left us. And so the body of sin is destroyed through such a cross, that now we should not yield our members as instruments of unrighteousness unto sin. Because, if even the inner man certainly is renewed day by day, yet undoubtedly it is old before it is renewed. For that is done inwardly of which the same apostle speaks: “Put off the old man, and put on the new;” which he goes on to explain by saying, “Wherefore, putting away lying, speak every man truth.” But where is lying put away, unless inwardly, that he who speaketh the truth from his heart may inhabit the holy hill of God? But the resurrection of the body of the Lord is shown to belong to the mystery of our own inner resurrection, where, after He had risen, He says to the woman, “Touch me not, for I am not yet ascended to my Father;” with which mystery the apostle’s words agree, where he says, “If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God; set your thoughts on things above.” For not to touch Christ, unless when He had ascended to the Father, means not to have thoughts of Christ after a fleshly manner. Again, the death of the flesh of our Lord contains a type of the death of our outer man, since it is by such suffering most of all that He exhorts His servants that they should not fear those who kill the body, but are not able to kill the soul. Wherefore the apostle says, “That I may fill up that which is behind of the afflictions of Christ in my flesh.” And the resurrection of the body of the Lord is found to contain a type of the resurrection of our outward man, because He says to His disciples, “Handle me, and see; for a spirit hath not flesh and bones, as ye see me have.” And one of the disciples also, handling His scars, exclaimed, “My Lord and my God!” And whereas the entire integrity of that flesh was apparent, this was shown in that which He had said when exhorting His disciples: “There shall not a hair of your head perish.” For how comes it that first is said, “Touch me not, for I am not yet ascended to my Father;” and how comes it that before He ascends to the Father, He actually is touched by the disciples: unless because in the former the mystery of the inner man was intimated, in the latter a type was given of the outer man? Or can any one possibly be so without understanding, and so turned away from the truth, as to dare to say that He was touched by men before He ascended, but by women when He had ascended? It was on account of this type, which went before in the Lord, of our future resurrection in the body, that the apostle says, “Christ the first-fruits; afterward they that are Christ’s.” For it was the resurrection of the body to which this place refers, on account of which he also says, “Who has changed our vile body, that it may be fashioned like unto His glorious body.” The one death therefore of our Saviour brought salvation to our double death, and His one resurrection wrought for us two resurrections; since His body in both cases, that is, both in His death and in His resurrection, was ministered to us by a kind of healing suitableness, both as a mystery of the inner man, and as a type of the outer.