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.
- Since, then, we were not fit to take hold of things eternal, and since the foulness of sins weighed us down, which we had contracted by the love of temporal things, and which were implanted in us as it were naturally, from the root of mortality, it was needful that we should be cleansed. But cleansed we could not be, so as to be tempered together with things eternal, except it were through things temporal, wherewith we were already tempered together and held fast. For health is at the opposite extreme from disease; but the intermediate process of healing does not lead us to perfect health, unless it has some congruity with the disease. Things temporal that are useless merely deceive the sick; things temporal that are useful take up those that need healing, and pass them on healed, to things eternal. And the rational mind, as when cleansed it owes contemplation to things eternal; so, when needing cleansing, owes faith to things temporal. One even of those who were formerly esteemed wise men among the Greeks has said, The truth stands to faith in the same relation in which eternity stands to that which has a beginning. And he is no doubt right in saying so. For what we call temporal, he describes as having had a beginning. And we also ourselves come under this kind, not only in respect to the body, but also in respect to the changeableness of the soul. For that is not properly called eternal which undergoes any degree of change. Therefore, in so far as we are changeable, in so far we stand apart from eternity. But life eternal is promised to us through the truth, from the clear knowledge of which, again, our faith stands as far apart as mortality does from eternity. We then now put faith in things done in time on our account, and by that faith itself we are cleansed; in order that when we have come to sight, as truth follows faith, so eternity may follow upon mortality. And therefore, since our faith will become truth, when we have attained to that which is promised to us who believe: and that which is promised us is eternal life; and the Truth (not that which shall come to be according as our faith shall be, but that truth which is always, because in it is eternity,—the Truth then) has said, “And this is life eternal, that they might know Thee the only true God, and Jesus Christ, whom Thou hast sent:” when our faith by seeing shall come to be truth, then eternity shall possess our now changed mortality. And until this shall take place, and in order that it may take place,—because we adapt the faith of belief to things which have a beginning, as in things eternal we hope for the truth of contemplation, lest the faith of mortal life should be at discord with the truth of eternal life,—the Truth itself, co-eternal with the Father, took a beginning from earth, when the Son of God so came as to become the Son of man, and to take to Himself our faith, that He might thereby lead us on to His own truth, who so undertook our mortality, as not to lose His own eternity. For truth stands to faith in the relation in which eternity stands to that which has a beginning. Therefore, we must needs so be cleansed, that we may come to have such a beginning as remains eternal, that we may not have one beginning in faith, and another in truth. Neither could we pass to things eternal from the condition of having a beginning, unless we were transferred, by union of the eternal to ourselves through our own beginning, to His own eternity. Therefore our faith has, in some measure, now followed thither, whither He in whom we have believed has ascended; born, dead, risen again, taken up. Of these four things, we knew the first two in ourselves. For we know that men both have a beginning and die. But the remaining two, that is, to be raised, and to be taken up, we rightly hope will be in us, because we have believed them done in Him. Since, therefore, in Him that, too, which had a beginning has passed over to eternity, in ourselves also it will so pass over, when faith shall have arrived at truth. For to those who thus believe, in order that they might remain in the word of faith, and being thence led on to the truth, and through that to eternity, might be freed from death, He speaks thus: “If ye continue in my word, then are ye my disciples indeed.” And as though they would ask, With what fruit? He proceeds to say, “And ye shall know the truth.” And again, as though they would say, Of what good is truth to mortal men? “And the truth,” He says, “shall make you free.” From what, except from death, from corruptions, from changeableness? Since truth remains immortal, incorrupt, unchangeable. But true immortality, true incorruptibility, true unchangeableness, is eternity itself.