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.
Excepting, therefore, all these things as I just now said, there are some also of another kind; which, although from the same corporeal substance, are yet brought within reach of our senses in order to announce something from God, and these are properly called miracles and signs; yet is not the person of God Himself assumed in all things which are announced to us by the Lord God. When, however, that person is assumed, it is sometimes made manifest as an angel; sometimes in that form which is not an angel in his own proper being, although it is ordered and ministered by an angel. Again, when it is assumed in that form which is not an angel in his own proper being; sometimes in this case it is a body itself already existing, assumed after some kind of change, in order to make that message manifest; sometimes it is one that comes into being for the purpose, and that being accomplished, is discarded. Just as, also, when men are the messengers, sometimes they speak the words of God in their own person, as when it is premised, “The Lord said,” or, “Thus saith the Lord,” or any other such phrase, but sometimes without any such prefix, they take upon themselves the very person of God, as e.g.: “I will instruct thee, and teach thee in the way wherein thou shalt go:” so, not only in word, but also in act, the signifying of the person of God is imposed upon the prophet, in order that he may bear that person in the ministering of the prophecy; just as he, for instance, bore that person who divided his garment into twelve parts, and gave ten of them to the servant of King Solomon, to the future king of Israel. Sometimes, also, a thing which was not a prophet in his own proper self, and which existed already among earthly things, was assumed in order to signify this; as Jacob, when he had seen the dream, upon waking up did with the stone, which when asleep he had under his head. Sometimes a thing is made in the same kind, for the mere purpose; so as either to continue a little while in existence, as that brazen serpent was able to do which was lifted up in the wilderness, and as written records are able to do likewise; or so as to pass away after having accomplished its ministry, as the bread made for the purpose is consumed in the receiving of the sacrament.
-
But because these things are known to men, in that they are done by men, they may well meet with reverence as being holy things, but they cannot cause wonder as being miracles. And therefore those things which are done by angels are the more wonderful to us, in that they are more difficult and more known; but they are known and easy to them as being their own actions. An angel speaks in the person of God to man, saying, “I am the God of Abraham, and the God of Isaac, and the God of Jacob;” the Scripture having said just before, “The angel of the Lord appeared to him.” And a man also speaks in the person of God, saying, “Hear, O my people, and I will testify unto thee, O Israel: I am the Lord thy God.” A rod was taken to serve as a sign, and was changed into a serpent by angelical power; but although that power is wanting to man, yet a stone was taken also by man for a similar sign. There is a wide difference between the deed of the angel and the deed of the man. The former is both to be wondered at and to be understood, the latter only to be understood. That which is understood from both, is perhaps one and the same; but those things from which it is understood, are different. Just as if the name of God were written both in gold and in ink; the former would be the more precious, the latter the more worthless; yet that which is signified in both is one and the same. And although the serpent that came from Moses’ rod signified the same thing as Jacob’s stone, yet Jacob’s stone signified something better than did the serpents of the magicians. For as the anointing of the stone signified Christ in the flesh, in which He was anointed with the oil of gladness above His fellows; so the rod of Moses, turned into a serpent, signified Christ Himself made obedient unto death, even the death of the cross. Whence it is said, “And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up, that whosoever believeth in Him should not perish, but have everlasting life;” just as by gazing on that serpent which was lifted up in the wilderness, they did not perish by the bites of the serpents. For “our old man is crucified with Him, that the body of sin might be destroyed.” For by the serpent death is understood, which was wrought by the serpent in paradise, the mode of speech expressing the effect by the efficient. Therefore the rod passed into the serpent, Christ into death; and the serpent again into the rod, whole Christ with His body into the resurrection; which body is the Church; and this shall be in the end of time, signified by the tail, which Moses held, in order that it might return into a rod. But the serpents of the magicians, like those who are dead in the world, unless by believing in Christ they shall have been as it were swallowed up by, and have entered into, His body, will not be able to rise again in Him. Jacob’s stone, therefore, as I said, signified something better than did the serpents of the magicians; yet the deed of the magicians was much more wonderful. But these things in this way are no hindrance to the understanding of the matter; just as if the name of a man were written in gold, and that of God in ink.
-
What man, again, knows how the angels made or took those clouds and fires in order to signify the message they were bearing, even if we supposed that the Lord or the Holy Spirit was manifested in those corporeal forms? Just as infants do not know of that which is placed upon the altar and consumed after the performance of the holy celebration, whence or in what manner it is made, or whence it is taken for religious use. And if they were never to learn from their own experience or that of others, and never to see that species of thing except during the celebration of the sacrament, when it is being offered and given; and if it were told them by the most weighty authority whose body and blood it is; they will believe nothing else, except that the Lord absolutely appeared in this form to the eyes of mortals, and that that liquid actually flowed from the piercing of a side which resembled this. But it is certainly a useful caution to myself, that I should remember what my own powers are, and admonish my brethren that they also remember what theirs are, lest human infirmity pass on beyond what is safe. For how the angels do these things, or rather, how God does these things by His angels, and how far He wills them to be done even by the bad angels, whether by permitting, or commanding, or compelling, from the hidden seat of His own supreme power; this I can neither penetrate by the sight of the eyes, nor make clear by assurance of reason, nor be carried on to comprehend it by reach of intellect, so as to speak thereupon to all questions that may be asked respecting these matters, as certainly as if I were an angel, or a prophet, or an apostle. “For the thoughts of mortal men are miserable, and our devices are but uncertain. For the corruptible body presseth down the soul, and the earthly tabernacle weigheth down the mind, that museth upon many things. And hardly do we guess aright at things that are upon earth, and with labor do we find the things that are before us; but the things that are in heaven, who hath searched out?” But because it goes on to say, “And Thy counsel who hath known, except Thou give wisdom, and send Thy Holy Spirit from above;” therefore we refrain indeed from searching out the things which are in heaven, under which kind are contained both angelical bodies according to their proper dignity, and any corporeal action of those bodies; yet, according to the Spirit of God sent to us from above, and to His grace imparted to our minds, I dare to say confidently, that neither God the Father, nor His Word, nor His Spirit, which is the one God, is in any way changeable in regard to that which He is, and whereby He is that which He is; and much less is in this regard visible. Since there are no doubt some things changeable, yet not visible, as are our thoughts, and memories, and wills, and the whole incorporeal creature; but there is nothing that is visible that is not also changeable.