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.
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For it is one thing to make and administer the creature from the innermost and highest turning-point of causation, which He alone does who is God the Creator; but quite another thing to apply some operation from without in proportion to the strength and faculties assigned to each by Him, so that what is created may come forth into being at this time or at that, and in this or that way. For all these things in the way of original and beginning have already been created in a kind of texture of the elements, but they come forth when they get the opportunity. For as mothers are pregnant with young, so the world itself is pregnant with the causes of things that are born; which are not created in it, except from that highest essence, where nothing either springs up or dies, either begins to be or ceases. But the applying from without of adventitious causes, which, although they are not natural, yet are to be applied according to nature, in order that those things which are contained and hidden in the secret bosom of nature may break forth and be outwardly created in some way by the unfolding of the proper measures and numbers and weights which they have received in secret from Him “who has ordered all things in measure and number and weight:” this is not only in the power of bad angels, but also of bad men, as I have shown above by the example of agriculture.
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But lest the somewhat different condition of animals should trouble any one, in that they have the breath of life with the sense of desiring those things that are according to nature, and of avoiding those things that are contrary to it; we must consider also, how many men there are who know from what herbs or flesh, or from what juices or liquids you please, of whatever sort, whether so placed or so buried, or so bruised or so mixed, this or that animal is commonly born; yet who can be so foolish as to dare to call himself the creator of these animals? Is it, therefore, to be wondered at, if just as any, the most worthless of men, can know whence such or such worms and flies are produced; so the evil angels in proportion to the subtlety of their perceptions discern in the more hidden seeds of the elements whence frogs and serpents are produced, and so through certain and known opportune combinations applying these seeds by secret movements, cause them to be created, but do not create them? Only men do not marvel at those things that are usually done by men. But if any one chance to wonder at the quickness of those growths, in that those living beings were so quickly made, let him consider how even this may be brought about by men in proportion to the measure of human capability. For whence is it that the same bodies generate worms more quickly in summer than in winter, or in hotter than in colder places? Only these things are applied by men with so much the more difficulty, in proportion as their earthly and sluggish members are wanting in subtlety of perception, and in rapidity of bodily motion. And hence it arises that in the case of any kind of angels, in proportion as it is easier for them to draw out the proximate causes from the elements, so much the more marvellous is their rapidity in works of this kind.
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But He only is the creator who is the chief former of these things. Neither can any one be this, unless He with whom primarily rests the measure, number, and weight of all things existing; and He is God the one Creator, by whose unspeakable power it comes to pass, also, that what these angels were able to do if they were permitted, they are therefore not able to do because they are not permitted. For there is no other reason why they who made frogs and serpents were not able to make the most minute flies, unless because the greater power of God was present prohibiting them, through the Holy Spirit; which even the magicians themselves confessed, saying, “This is the finger of God.” But what they are able to do by nature, yet cannot do, because they are prohibited; and what the very condition of their nature itself does not suffer them to do; it is difficult, nay, impossible, for man to search out, unless through that gift of God which the apostle mentions when he says, “To another the discerning of spirits.” For we know that a man can walk, yet that he cannot do so if he is not permitted; but that he cannot fly, even if he be permitted. So those angels, also, are able to do certain things if they are permitted by more powerful angels, according to the supreme commandment of God; but cannot do certain other things, not even if they are permitted by them; because He does not permit from whom they have received such and such a measure of natural powers: who, even by His angels, does not usually permit what He has given them power to be able to do.
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Excepting, therefore, those corporeal things which are done in the order of nature in a perfectly usual series of times, as e.g., the rising and setting of the stars, the generations and deaths of animals, the innumerable diversities of seeds and buds, the vapors and the clouds, the snow and the rain, the lightnings and the thunder, the thunderbolts and the hail, the winds and the fire, cold and heat, and all like things; excepting also those which in the same order of nature occur rarely, such as eclipses, unusual appearances of stars, and monsters, and earthquakes, and such like;—all these, I say, are to be excepted, of which indeed the first and chief cause is only the will of God; whence also in the Psalm, when some things of this kind had been mentioned, “Fire and hail, snow and vapor, stormy wind,” lest any one should think those to be brought about either by chance or only from corporeal causes, or even from such as are spiritual, but exist apart from the will of God, it is added immediately, “fulfilling His word.”