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
When men seek to know God, and bend their minds according to the capacity of human weakness to the understanding of the Trinity; learning, as they must, by experience, the wearisome difficulties of the task, whether from the sight itself of the mind striving to gaze upon light unapproachable, or, indeed, from the manifold and various modes of speech employed in the sacred writings (wherein, as it seems to me, the mind is nothing else but roughly exercised, in order that it may find sweetness when glorified by the grace of Christ);—such men, I say, when they have dispelled every ambiguity, and arrived at something certain, ought of all others most easily to make allowance for those who err in the investigation of so deep a secret. But there are two things most hard to bear with, in the case of those who are in error: hasty assumption before the truth is made plain; and, when it has been made plain, defence of the falsehood thus hastily assumed. From which two faults, inimical as they are to the finding out of the truth, and to the handling of the divine and sacred books, should God, as I pray and hope, defend and protect me with the shield of His good will, and with the grace of His mercy, I will not be slow to search out the substance of God, whether through His Scripture or through the creature. For both of these are set forth for our contemplation to this end, that He may Himself be sought, and Himself be loved, who inspired the one, and created the other. Nor shall I be afraid of giving my opinion, in which I shall more desire to be examined by the upright, than fear to be carped at by the perverse. For charity, most excellent and unassuming, gratefully accepts the dovelike eye; but for the dog’s tooth nothing remains, save either to shun it by the most cautious humility, or to blunt it by the most solid truth; and far rather would I be censured by any one whatsoever, than be praised by either the erring or the flatterer. For the lover of truth need fear no one’s censure. For he that censures, must needs be either enemy or friend. And if an enemy reviles, he must be borne with: but a friend, if he errs, must be taught; if he teaches, listened to. But if one who errs praises you, he confirms your error; if one who flatters, he seduces you into error. “Let the righteous,” therefore, “smite me, it shall be a kindness; and let him reprove me; but the oil of the sinner shall not anoint my head.”