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Chapter I. Not only were the prophets and apostles sent by the Spirit, but also the Son of God. This is proved from Isaiah and the evangelists, and it is explained why St. Luke wrote that the same Spirit descended like a dove upon Christ and abode upon Him. Next, after establishing this mission of Christ, the writer infers that the Son is sent by the Father and the Spirit, as the Spirit is by the Father and the Son.
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Chapter II. The Son and the Spirit are alike given; whence not subjection but one Godhead is shown by Its working.iv.ii.iv.ii
Chapter III. The same Unity may also be recognized from the fact that the Spirit is called Finger, and the Son Right Hand; for the understanding of divine things is assisted by the usage of human language. The tables of the law were written by this Finger, and they were afterwards broken, and the reason. Lastly, Christ wrote with the same Finger; yet we must not admit any inferiority in the Spirit from this bodily comparison.iv.ii.iv.iii
Chapter IV. To those who contend that the Spirit because He is called the Finger is less than the Father, St. Ambrose replies that this would also tend to the lessening of the Son, Who is called the Right Hand. That these names are to be referred only to the Unity, for which reason Moses proclaimed that the whole Trinity worked in the passage of the Red Sea. And, indeed, it is no wonder that the operation of the Spirit found place there, where there was a figure of baptism, since the Scripture teaches that the Three Persons equally sanctify and are operative in that sacrament.iv.ii.iv.iv
Chapter V. The writer sums up the argument he had commenced, and confirms the statement that unity is signified by the terms finger and right hand, from the fact that the works of God are the same as are the works of hands; and that those of hands are the same as those of fingers; and lastly, that the term hand applies equally to the Son and the Spirit, and that of finger applies to the Spirit and the Son.iv.ii.iv.v
Chapter VI. The Spirit rebukes just as do the Father and the Son; and indeed judges could not judge without Him, as is shown by the judgments of Solomon and Daniel, which are explained in a few words, by the way; and no other than the Holy Spirit inspired Daniel.iv.ii.iv.vi
Chapter VII. The Son Himself does not judge or punish without the Spirit, so that the same Spirit is called the Sword of the Word. But inasmuch as the Word is in turn called the Sword of the Spirit, the highest unity of power is thereby recognized in each.iv.ii.iv.vii
Chapter VIII. The aforesaid unity is proved hereby, that as the Father is said to be grieved and tempted, so too the Son. The Son was also tempted in the wilderness, where a figure of the cross was set up in the brazen serpent: but the Apostle says that the Spirit also was there tempted. St. Ambrose infers from this that the Israelites were guided into the promised land by the same Spirit, and that His will and power are one with those of the Father and the Son.iv.ii.iv.viii
Chapter IX. That the Holy Spirit is provoked is proved by the words of St. Peter, in which it is shown that the Spirit of God is one and the same as the Spirit of the Lord, both by other passages and by reference to the sentence of the same Apostle on Ananias and Sapphira, whence it is argued that the union of the Holy Spirit with the Father and the Son, as well as His own Godhead, is proved.iv.ii.iv.ix
Chapter X. The Divinity of the Holy Spirit is supported by a passage of St. John. This passage was, indeed, erased by heretics, but it is a vain attempt, since their faithlessness could thereby more easily be convicted. The order of the context is considered in order that this passage may be shown to refer to the Spirit. He is born of the Spirit who is born again of the same Spirit, of Whom Christ Himself is believed to have been born and born again. Again, the Godhead of the Spirit is inferred from two testimonies of St. John; and lastly, it is explained how the Spirit, the water, and the blood are called witnesses.iv.ii.iv.x
Chapter XI. The objection has been made, that the words of St. John, “The Spirit is God,” are to be referred to God the Father; since Christ afterwards declares that God is to be worshipped in Spirit and in truth. The answer is, first, that by the word Spirit is sometimes meant spiritual grace; next, it is shown that, if they insist that the Person of the Holy Spirit is signified by the words “in Spirit,” and therefore deny that adoration is due to Him, the argument tells equally against the Son; and since numberless passages prove that He is to be worshipped, we understand from this that the same rule is to be laid down as regards the Spirit. Why are we commanded to fall down before His footstool? Because by this is signified the Lord's Body, and as the Spirit was the Maker of this, it follows that He is to be worshipped, and yet it does not accordingly follow that Mary is to be worshipped. Therefore the worship of the Spirit is not done away with, but His union with the Father is expressed, when it is said that the Father is to be worshipped in Spirit, and this point is supported by similar expressions.iv.ii.iv.xi
Chapter XII. From the fact that St. Paul has shown that the light of the Godhead which the three apostles worshipped in Christ is in the Trinity, it is made clear that the Spirit also is to be worshipped. It is shown from the words themselves that the Spirit is intended by the apostles. The Godhead of the same Spirit is proved from the fact that He has a temple wherein He dwells not as a priest, but as God: and is worshipped with the Father and the Son; whence is understood the oneness of nature in Them.iv.ii.iv.xii
Chapter XIII. To those who object that Catholics, when they ascribe Godhead to the Holy Spirit, introduce three Gods, it is answered, that by the same argument they themselves bring in two Gods, unless they deny Godhead to the Son; after which the orthodox doctrine is set forth.iv.ii.iv.xiii
Chapter XIV. Besides the evidence adduced above, other passages can be brought to prove the sovereignty of the Three Persons. Two are quoted from the Epistles to the Thessalonians, and by collating other testimonies of the Scriptures it is shown that in them dominion is claimed for the Spirit as for the other Persons. Then, by quotation of another still more express passage in the second Epistle to the Corinthians, it is inferred both that the Spirit is Lord, and that where the Lord is, there is the Spirit.iv.ii.iv.xiv
Chapter XV. Though the Spirit be called Lord, three Lords are not thereby implied; inasmuch as two Lords are not implied by the fact that the Son in the same manner as the Father is called Lord in many passages of Scripture; for Lordship exists in the Godhead, and the Godhead in Lordship, and these coincide without division in the Three Persons.iv.ii.iv.xv
Chapter XVI. The Father is holy, and likewise the Son and the Spirit, and so They are honoured in the same Trisagion: nor can we speak more worthily of God than by calling Him Holy; whence it is clear that we must not derogate from the dignity of the Holy Spirit. In Him is all which pertains to God, since in baptism He is named with the Father and the Son, and the Father has given to Him to be greater than all, nor can any one deprive Him of this. And so from the very passage of St. John which heretics used against His dignity, the equality of the Trinity and the Unity of the Godhead is established. Lastly, after explaining how the Son receives from the Father, St. Ambrose shows how various heresies are refuted by the passage cited.iv.ii.iv.xvi
Chapter XVII. St. Ambrose shows by instances that the places in which those words were spoken help to the understanding of the words of the Lord; he shows that Christ uttered the passage quoted from St. John in Solomon's porch, by which is signified the mind of a wise man, for he says that Christ would not have uttered this saying in the heart of a foolish or contentious man. He goes on to say that Christ is stoned by those who believe not these words, and as the keys of heaven were given to Peter for his confession of them, so Iscariot, because he believed not the same, perished evilly. He takes this opportunity to inveigh against the Jews who bought the Son of God and sold Joseph. He explains the price paid for each mystically; and having in the same manner expounded the murmuring of the traitor concerning Magdalene's ointment, he adds that Christ is bought in one way by heretics in another way by Catholics, and that those in vain take to themselves the name of Christians who sever the Spirit from the Father.iv.ii.iv.xvii
Chapter XVIII. As he purposes to establish the Godhead of the Holy Spirit by the points already discussed, St. Ambrose touches again on some of them; for instance, that He does not commit but forgives sin; that He is not a creature but the Creator; and lastly, that He does not offer but receives worship.iv.ii.iv.xviii
Chapter XIX. Having proved above that the Spirit abides and speaks in the prophets, St. Ambrose infers that He knows all things which are of God, and therefore is One with the Father and the Son. This same point he establishes again from the fact that He possesses all that God possesses, namely, Godhead, knowledge of the heart, truth, a Name above every name, and power to raise the dead, as is proved from Ezekiel, and in this He is equal to the Son.iv.ii.iv.xix
Chapter XX. The river flowing from the Throne of God is a figure of the Holy Spirit, but by the waters spoken of by David the powers of heaven are intended. The kingdom of God is the work of the Spirit; and it is no matter for wonder if He reigns in this together with the Son, since St. Paul promises that we too shall reign with the Son.iv.ii.iv.xx
Chapter XXI. Isaiah was sent by the Spirit, and accordingly the same Spirit was seen by him. What is meant by the revolving wheels, and the divers wings, and how since the Spirit is proclaimed Lord of Sabaoth by the Seraphim, certainly none but impious men can deny Him this title.iv.ii.iv.xxi
Chapter XXII. In proof of the Unity in Trinity the passage of Isaiah which has been cited is considered, and it is shown that there is no difference as to its sense amongst those who expound it of the Father, or of the Son, or of the Spirit. If He Who was crucified was Lord of glory, so, too, is the Holy Spirit equal in all things to the Father and the Son, and the Arians will never be able to diminish His glory.iv.ii.iv.xxii