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.
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Wherefore, since the spirit is to be preferred to the body, and the death of the spirit means that God has left it, but the death of the body that the spirit has left it; and since herein lies the punishment in the death of the body, that the spirit leaves the body against its will, because it left God willingly; so that, whereas the spirit left God because it would, it leaves the body although it would not; nor leaves it when it would, unless it has offered violence to itself, whereby the body itself is slain: the spirit of the Mediator showed how it was through no punishment of sin that He came to the death of the flesh, because He did not leave it against His will, but because He willed, when He willed, as He willed. For because He is so commingled [with the flesh] by the Word of God as to be one, He says: “I have power to lay down my life, and I have power to take it again. No man taketh it from me, but I lay down my life that I might take it again.” And, as the Gospel tells us, they who were present were most astonished at this, that after that [last] word, in which He set forth the figure of our sin, He immediately gave up His spirit. For they who are hung on the cross are commonly tortured by a prolonged death. Whence it was that the legs of the thieves were broken, in order that they might die directly, and be taken down from the cross before the Sabbath. And that He was found to be dead already, caused wonder. And it was this also, at which, as we read, Pilate marvelled, when the body of the Lord was asked of him for burial.
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Because that deceiver then,—who was a mediator to death for man, and feignedly puts himself forward as to life, under the name of cleansing by sacrilegious rites and sacrifices, by which the proud are led away,—can neither share in our death, nor rise again from his own: he has indeed been able to apply his single death to our double one; but he certainly has not been able to apply a single resurrection, which should be at once a mystery of our renewal, and a type of that waking up which is to be in the end. He then who being alive in the spirit raised again His own flesh that was dead, the true Mediator of life, has cast out him, who is dead in the spirit and the mediator of death, from the spirits of those who believe in Himself, so that he should not reign within, but should assault from without, and yet not prevail. And to him, too, He offered Himself to be tempted, in order that He might be also a mediator to overcome his temptations, not only by succor, but also by example. But when the devil, from the first, although striving through every entrance to creep into His inward parts, was thrust out, having finished all his alluring temptation in the wilderness after the baptism; because, being dead in the spirit, he forced no entrance into Him who was alive in the spirit, he betook himself, through eagerness for the death of man in any way whatsoever, to effecting that death which he could, and was permitted to effect it upon that mortal element which the living Mediator had received from us. And where he could do anything, there in every respect he was conquered; and wherein he received outwardly the power of slaying the Lord in the flesh, therein his inward power, by which he held ourselves, was slain. For it was brought to pass that the bonds of many sins in many deaths were loosed, through the one death of One which no sin had preceded. Which death, though not due, the Lord therefore rendered for us, that the death which was due might work us no hurt. For He was not stripped of the flesh by obligation of any authority, but He stripped Himself. For doubtless He who was able not to die, if He would not, did die because He would: and so He made a show of principalities and powers, openly triumphing over them in Himself. For whereas by His death the one and most real sacrifice was offered up for us, whatever fault there was, whence principalities and powers held us fast as of right to pay its penalty, He cleansed, abolished, extinguished; and by His own resurrection He also called us whom He predestinated to a new life; and whom He called, them He justified; and whom He justified, them He glorified. And so the devil, in that very death of the flesh, lost man, whom he was possessing as by an absolute right, seduced as he was by his own consent, and over whom he ruled, himself impeded by no corruption of flesh and blood, through that frailty of man’s mortal body, whence he was both too poor and too weak; he who was proud in proportion as he was, as it were, both richer and stronger, ruling over him who was, as it were, both clothed in rags and full of troubles. For whither he drove the sinner to fall, himself not following, there by following he compelled the Redeemer to descend. And so the Son of God deigned to become our friend in the fellowship of death, to which because he came not, the enemy thought himself to be better and greater than ourselves. For our Redeemer says, “Greater love hath no man than this, that a man lay down his life for his friends.” Wherefore also the devil thought himself superior to the Lord Himself, inasmuch as the Lord in His sufferings yielded to him; for of Him, too, is understood what is read in the Psalm, “For Thou hast made Him a little lower than the angels:” so that He, being Himself put to death, although innocent, by the unjust one acting against us as it were by just right, might by a most just right overcome him, and so might lead captive the captivity wrought through sin, and free us from a captivity that was just on account of sin, by blotting out the handwriting, and redeeming us who were to be justified although sinners, through His own righteous blood unrighteously poured out.
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Hence also the devil mocks those who are his own until this very day, to whom he presents himself as a false mediator, as though they would be cleansed or rather entangled and drowned by his rites, in that he very easily persuades the proud to ridicule and despise the death of Christ, from which the more he himself is estranged, the more is he believed by them to be the holier and more divine. Yet those who have remained with him are very few, since the nations acknowledge and with pious humility imbibe the price paid for themselves, and in trust upon it abandon their enemy, and gather together to their Redeemer. For the devil does not know how the most excellent wisdom of God makes use of both his snares and his fury to bring about the salvation of His own faithful ones, beginning from the former end, which is the beginning of the spiritual creature, even to the latter end, which is the death of the body, and so “reaching from the one end to the other, mightily and sweetly ordering all things.” For wisdom “passeth and goeth through all things by reason of her pureness, and no defiled thing can fall into her.” And since the devil has nothing to do with the death of the flesh, whence comes his exceeding pride, a death of another kind is prepared in the eternal fire of hell, by which not only the spirits that have earthly, but also those who have aerial bodies, can be tormented. But proud men, by whom Christ is despised, because He died, wherein He bought us with so great a price, both bring back the former death, and also men, to that miserable condition of nature, which is derived from the first sin, and will be cast down into the latter death with the devil. And they on this account preferred the devil to Christ, because the former cast them into that former death, whither he himself fell not through the difference of his nature, and whither on account of them Christ descended through His great mercy: and yet they do not hesitate to believe themselves better than the devils, and do not cease to assail and denounce them with every sort of malediction, while they know them at any rate to have nothing to do with the suffering of this kind of death, on account of which they despise Christ. Neither will they take into account that the case may possibly be, that the Word of God, remaining in Himself, and in Himself in no way changeable, may yet, through the taking upon Him of a lower nature, be able to suffer somewhat of a lower kind, which the unclean spirit cannot suffer, because he has not an earthly body. And so, whereas they themselves are better than the devils, yet, because they bear a body of flesh, they can so die, as the devils certainly cannot die, who do not bear such a body. They presume much on the deaths of their own sacrifices, which they do not perceive that they sacrifice to deceitful and proud spirits; or if they have come to perceive it, think their friendship to be of some good to themselves, treacherous and envious although they are, whose purpose is bent upon nothing else except to hinder our return.