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Chapter I. The marvel is, not that men have failed to know Christ, but that they have not listened to the words of the Scriptures. Christ, indeed, was not known, even of angels, save by revelation, nor again, by His forerunner. Follows a description of Christ's triumphal ascent into heaven, and the excellence of its glory over the assumption of certain prophets. Lastly, from exposition of the conversation with angels upon this occasion, the omnipotence of the Son is proved, as against the Arians.
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Chapter II. None can ascend to heaven without faith; in any case, he who hath so ascended thither will be cast out wherefore, faith must be zealously preserved. We ourselves each have a heaven within, the gates whereof must be opened and be raised by confession of the Godhead of Christ, which gates are not raised by Arians, nor by those who seek the Son amongst earthly things, and who must therefore, like the Magdalene, be sent back to the apostles, against whom the gates of hell shall not prevail. Scriptures are cited to show that the servant of the Lord must not diminish aught of his Master's honour.iv.iv.vi.ii
Chapter III. The words, “The head of every man is Christ…and the head of Christ is God” misused by the Arians, are now turned back against them, to their confutation. Next, another passage of Scripture, commonly taken by the same heretics as a ground of objection, is called in to show that God is the Head of Christ, in so far as Christ is human, in regard of His Manhood, and the unwisdom of their opposition upon the text, “He who planteth and He who watereth are one,” is displayed. After which explanations, the meaning of the doctrine that the Father is in the Son, and the Son in the Father, and that the faithful are in Both, is expounded.iv.iv.vi.iii
Chapter IV. The passage quoted adversely by heretics, namely, “The Son can do nothing of Himself,” is first explained from the words which follow; then, the text being examined, word by word, their acceptation in the Arian sense is shown to be impossible without incurring the charge of impiety or absurdity, the proof resting chiefly on the creation of the world and certain miracles of Christ.iv.iv.vi.iv
Chapter V. Continuing the exposition of the disputed passage, which he had begun, Ambrose brings forward four reasons why we affirm that something cannot be, and shows that the first three fail to apply to Christ, and infers that the only reason why the Son can do nothing of Himself is His Unity in Power with the Father.iv.iv.vi.v
Chapter VI. The fourth kind of impossibility (§49) is now taken into consideration, and it is shown that the Son does nothing that the Father approves not, there being between Them perfect unity of will and power.iv.iv.vi.vi
Chapter VII. The doctrine had in view for enforcement is corroborated by the truth that the Son is the Word of the Father--the Word, not in the sense in which we understand the term, but a living and active Word. This being so, we cannot deny Him to be of the same Will, Power, and Substance with the Father.iv.iv.vi.vii
Chapter VIII. The heretical objection, that the Son cannot be equal to the Father, because He cannot beget a Son, is turned back upon the authors of it. From the case of human nature it is shown that whether a person begets offspring or not, has nothing to do with his power. Most of all must this be true since, otherwise, the Father Himself would have to be pronounced wanting in power. Whence it follows that we have no right to judge of divine things by human, and must take our stand upon the authority of Holy Writ, otherwise we must deny all power either to the Father or to the Son.iv.iv.vi.viii
Chapter IX. Various quibbling arguments, advanced by the Arians to show that the Son had a beginning of existence, are considered and refuted, on the ground that whilst the Arians plainly prove nothing, or if they prove anything, prove it against themselves, (inasmuch as He Who is the beginning of all cannot Himself have a beginning), their reasonings do not even hold true with regard to facts of human existence. Time could not be before He was, Who is the Author of time--if indeed at some time He was not in existence, then the Father was without His Power and Wisdom. Again, our own human experience shows that a person is said to exist before he is born.iv.iv.vi.ix
Chapter X. The objection that Christ, on the showing of St. John, lives because of the Father, and therefore is not to be regarded as equal with the Father, is met by the reply that for the Life of the Son, in respect of His Godhead, there has never been a time when it began; and that it is dependent upon none, whilst the passage in question must be understood as referring to His human life, as is shown by His speaking there of His body and blood. Two expositions of the passage are given, the one of which is shown to refer to Christ's Manhood, whilst the second teaches His equality with the Father, as also His likeness with men. Rebuke is administered to the Arians for the insult which they are seeking to inflict upon the Son, and the sense in which the Son can be said to live “because of” the Father is explained, as also the union of life with the divine Life. A further objection, based upon the Son's prayer that He may be glorified by the Father, is briefly refuted.iv.iv.vi.x
Chapter XI. The particular distinction which the Arians endeavoured to prove upon the Apostle's teaching that all things are “of” the Father and “through” the Son, is overthrown, it being shown that in the passage cited the same Omnipotence is ascribed both to Father and to Son, as is proved from various texts, especially from the words of St. Paul himself, in which heretics foolishly find a reference to the Father only, though indeed there is no diminution or inferiority of the Son's sovereignty proved, even by such a reference. Finally, the three phrases, “of Whom,” “through Whom,” “in Whom,” are shown to suppose or imply no difference (of power), and each and all to hold true of the Three Persons.iv.iv.vi.xi
Chapter XII. The comparison, found in the Gospel of St. John, of the Son to a Vine and the Father to a husbandman, must be understood with reference to the Incarnation. To understand it with reference to the Divine Generation is to doubly insult the Son, making Him inferior to St. Paul, and bringing Him down to the level of the rest of mankind, as well as in like manner the Father also, by making Him not merely to be on one footing with the same Apostle, but even of no account at all. The Son, indeed, in so far as being God, is also the husbandman, and, as regards His Manhood, a grape-cluster. True statement of the Father's pre-eminence.iv.iv.vi.xii