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.
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But since we are exiled from the unchangeable joy, yet neither cut off nor torn away from it so that we should not seek eternity, truth, blessedness, even in those changeable and temporal things (for we wish neither to die, nor to be deceived, nor to be troubled); visions have been sent to us from heaven suitable to our state of pilgrimage, in order to remind us that what we seek is not here, but that from this pilgrimage we must return thither, whence unless we originated we should not here seek these things. And first we have had to be persuaded how much God loved us, lest from despair we should not dare to look up to Him. And we needed to be shown also what manner of men we are whom He loved, lest being proud, as if of our own merits, we should recede the more from Him, and fail the more in our own strength. And hence He so dealt with us, that we might the rather profit by His strength, and that so in the weakness of humility the virtue of charity might be perfected. And this is intimated in the Psalm, where it is said, “Thou, O God, didst send a spontaneous rain, whereby Thou didst make Thine inheritance perfect, when it was weary.” For by “spontaneous rain” nothing else is meant than grace, not rendered to merit, but given freely, whence also it is called grace; for He gave it, not because we were worthy, but because He willed. And knowing this, we shall not trust in ourselves; and this is to be made “weak.” But He Himself makes us perfect, who says also to the Apostle Paul, “My grace is sufficient for thee, for my strength is made perfect in weakness.” Man, then, was to be persuaded how much God loved us, and what manner of men we were whom He loved; the former, lest we should despair; the latter, lest we should be proud. And this most necessary topic the apostle thus explains: “But God commendeth,” he says, “His love towards us, in that, while we were yet sinners, Christ died for us. Much more then, being now justified by His blood, we shall be saved from wrath through Him. For if, when we were enemies, we were reconciled to God by the death of His Son; much more, being reconciled, we shall be saved by His life.” Also in another place: “What,” he says, “shall we then say to these things? If God be for us, who can be against us? He that spared not His own Son, but delivered Him up for us all, how has He not with Him also freely given us all things?” Now that which is declared to us as already done, was shown also to the ancient righteous as about to be done; that through the same faith they themselves also might be humbled, and so made weak; and might be made weak, and so perfected.
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Because therefore the Word of God is One, by which all things were made, which is the unchangeable truth, all things are simultaneously therein, potentially and unchangeably; not only those things which are now in this whole creation, but also those which have been and those which shall be. And therein they neither have been, nor shall be, but only are; and all things are life, and all things are one; or rather it is one being and one life. For all things were so made by Him, that whatsoever was made in them was not made in Him, but was life in Him. Since, “in the beginning,” the Word was not made, but “the Word was with God, and the Word was God, and all things were made by Him;” neither had all things been made by Him, unless He had Himself been before all things and not made. But in those things which were made by Him, even body, which is not life, would not have been made by Him, except it had been life in Him before it was made. For “that which was made was already life in Him;” and not life of any kind soever: for the soul also is the life of the body, but this too is made, for it is changeable; and by what was it made, except by the unchangeable Word of God? For “all things were made by Him; and without Him was not anything made that was made.” “What, therefore, was made was already life in Him;” and not any kind of life, but “the life [which] was the light of men;” the light certainly of rational minds, by which men differ from beasts, and therefore are men. Therefore not corporeal light, which is the light of the flesh, whether it shine from heaven, or whether it be lighted by earthly fires; nor that of human flesh only, but also that of beasts, and down even to the minutest of worms. For all these things see that light: but that life was the light of men; nor is it far from any one of us, for in it “we live, and move, and have our being.”