17. My soul has been burning to answer these insane attacks. I call to mind that the very centre of a saving faith is the belief not merely in God, but in God as a Father; not merely in Christ, but in Christ as the Son of God; in Him, not as a creature, but as God the Creator, born of God. My prime object is by the clear assertions of prophets and evangelists to refute the insanity and ignorance of men who use the unity of God (in itself a pious and profitable confession) as a cloak for their denial either that in Christ God was born, or else that He is very God. Their purpose is to isolate a solitary God at the heart of the faith by making Christ, though mighty, only a creature; because, so they allege, a birth of God widens the believer's faith into a trust in more gods than one. But we, divinely taught to confess neither two Gods nor yet a solitary God, will adduce the evidence of the Gospels and the prophets for our confession of God the Father and God the Son, united, not confounded, in our faith. We will not admit Their identity nor allow, as a compromise, that Christ is God in some imperfect sense; for God, born of God, cannot be the same as His Father, since He is His Son, nor yet can He be different in nature.
18. And you, whose warmth of faith and passion for a truth unknown to the world and its philosophers shall prompt to read me, must remember to eschew the feeble and baseless conjectures of earthly minds, and in devout willingness to learn must break down the barriers of prejudice and half-knowledge. The new faculties of the regenerate intellect are needed; each must have his understanding enlightened by the heavenly gift imparted to the soul. First he must take his stand upon the sure ground [substantia = hupostasei] of God, as holy Jeremiah says [517] , that since he is to hear about that nature [substantia] he may expand his thoughts till they are worthy of the theme, not fixing some arbitrary standard for himself, but judging as of infinity. And again, though he be aware that he is partaker of the Divine nature, as the holy apostle Peter says in his second Epistle [518] , yet he must not measure the Divine nature by the limitations of his own, but gauge God's assertions concerning Himself by the scale of His own glorious self-revelation. For he is the best student who does not read his thoughts into the book, but lets it reveal its own; who draws from it its sense, and does not import his own into it, nor force upon its words a meaning which he had determined was the right one before he opened its pages. Since then we are to discourse of the things of God, let us assume that God has full knowledge of Himself, and bow with humble reverence to His words. For He Whom we can only know through His own utterances is the fitting witness concerning Himself.
19. If in our discussion of the nature and birth of God we adduce certain analogies, let no one suppose that such comparisons are perfect and complete. There can be no comparison between God and earthly things, yet the weakness of our understanding forces us to seek for illustrations from a lower sphere to explain our meaning about loftier themes. The course of daily life shews how our experience in ordinary matters enables us to form conclusions on unfamiliar subjects. We must therefore regard any comparison as helpful to man rather than as descriptive of God, since it suggests, rather than exhausts, the sense we seek. Nor let such a comparison be thought too bold when it sets side by side carnal and spiritual natures, things invisible and things palpable, since it avows itself a necessary aid to the weakness of the human mind, and deprecates the condemnation due to an imperfect analogy. On this principle I proceed with my task, intending to use the terms supplied by God, yet colouring my argument with illustrations drawn from human life.
20. And first, I have so laid out the plan of the whole work as to consult the advantage of the reader by the logical order in which its books are arranged. It has been my resolve to publish no half-finished and ill-considered treatise, lest its disorderly array should resemble the confused clamour of a mob of peasants. And since no one can scale a precipice unless there be jutting ledges to aid his progress to the summit, I have here set down in order the primary outlines of our ascent leading our difficult course of argument up the easiest path; not cutting steps in the face of the rock, but levelling it to a gentle slope, that so the traveller, almost without a sense of effort may reach the heights.
21. Thus, after the present first book, the second expounds the mystery of the Divine birth, that those who shall be baptized in the Name of the Father and of the Son and of the Holy Ghost may know the true Names, and not be perplexed about their sense but accurately informed as to fact and meaning, and so receive full assurance that in the words which are used they have the true Names, and that those Names involve the truth.
22. After this short and simple discourse concerning the Trinity, the third book makes further progress, sure though slow. Citing the greatest instances of His power, it brings within the range of faith's understanding that saying, in itself beyond our comprehension, I in the Father and the Father in Me [519] , which Christ utters concerning Himself. Thus truth beyond the dull wit of man is the prize of faith equipped with reason and knowledge; for neither may we doubt God's Word concerning Himself, nor can we suppose that the devout reason is incapable of apprehending His might.
23. The fourth book starts with the doctrines of the heretics, and disowns complicity in the fallacies whereby they are traducing the faith of the Church. It publishes that infidel creed which a number of them have lately promulgated [520] , and exposes the dishonesty, and therefore the wickedness, of their arguments from the Law for what they call the unity of God. It sets out the whole evidence of Law and Prophets to demonstrate the impiety of asserting the unity of God to the exclusion of the Godhead of Christ, and the treason of alleging that if Christ be God the Only-begotten, then God is not one.
24. The fifth book follows in reply the sequence of heretical assertion. They had falsely declared that they followed the law in the sense which they assigned to the unity of God, and that they had proved from it that the true God is of one Person; and this in order to rob the Lord Christ of His birth by their conclusion concerning the One true God, for birth is the evidence of origin. In answer I assert, step by step, what they deny; for from the Law and the Prophets I demonstrate that there are not two gods, nor one isolated true God, neither perverting the faith in the Divine unity nor denying the birth of Christ. And since they say that the Lord Jesus Christ, created rather than born, bears the Divine Name by gift and not by right, I have proved His true Divinity from the Prophets in such a way that, He being acknowledged very God, the assurance of His inherent Godhead shall hold us fast to the certainty that God is One.
25. The sixth book reveals the full deceitfulness of this heretical teaching. To win credit for their assertions they denounce the impious doctrine of heretics:--of Valentinus, to wit, and Sabellius and Manichæus and Hieracas, and appropriate the godly language of the Church as a cover for their blasphemy. They reprove and alter the language of these heretics, correcting it into a vague resemblance to orthodoxy, in order to suppress the holy faith while apparently denouncing heresy. But we state clearly what is the language and what the doctrine of each of these men, and acquit the Church of any complicity or fellowship with condemned heretics. Their words which deserve condemnation we condemn, and those which claim our humble acceptance we accept. Thus that Divine Sonship of Jesus Christ, which is the object of their most strenuous denial, we prove by the witness of the Father, by Christ's own assertion, by the preaching of Apostles, by the faith of believers, by the cries of devils, by the contradiction of Jews, in itself a confession, by the recognition of the heathen who had not known God; and all this to rescue from dispute a truth of which Christ had left us no excuse for ignorance.
26. Next the seventh book, starting from the basis of a true faith now attained, delivers its verdict in the great debate. First, armed with its sound and incontrovertible proof of the impregnable faith, it takes part in the conflict raging between Sabellius and Hebion and these opponents of the true Godhead. It joins issue with Sabellius on his denial of the pre-existence of Christ, and with his assailants on their assertion that He is a creature. Sabellius overlooked the eternity of the Son, but believed that true God worked in a human body. Our present adversaries deny that He was born, assert that He was created, and fail to see in His deeds the works of very God. What both sides dispute, we believe. Sabellius denies that it was the Son who was working, and he is wrong; but he proves his case triumphantly when he alleges that the work done was that of true God. The Church shares his victory over those who deny that in Christ was very God. But when Sabellius denies that Christ existed before the worlds, his adversaries prove to conviction that Christ's activity is from everlasting, and we are on their side in this confutation of Sabellius, who recognises true God, but not God the Son, in this activity. And our two previous adversaries join forces to refute Hebion, the second demonstrating the eternal existence of Christ, while the first proves that His work is that of very God. Thus the heretics overthrow one another, while the Church, as against Sabellius, against those who call Christ a creature, against Hebion, bears witness that the Lord Jesus Christ is very God of very God, born before the worlds and born in after times as man.
27. No one can doubt that we have taken the course of true reverence and of sound doctrine when, after proving from Law and Prophets first that Christ is the Son of God, and next that He is true God, and this without breach of the mysterious unity, we proceed to support the Law and the Prophets by the evidence of the Gospels, and prove from them also that He is the Son of God and Himself very God. It is the easiest of tasks, after demonstrating His right to the Name of Son, to shew that the Name truly describes His relation to the Father; though indeed universal usage regards the granting of the name of son as convincing evidence of sonship. But, to leave no loophole for the trickery and deceit of these traducers of the true birth of God the Only-begotten, we have used His true Godhead as evidence of His true Sonship; to shew that He Who (as is confessed by all) bears the Name of Son of God is actually God, we have adduced His Name, His birth, His nature, His power, His assertions. We have proved that His Name is an accurate description of Himself, that the title of Son is an evidence of birth, that in His birth He retained His Divine Nature, and with His nature His power, and that that power manifested itself in conscious and deliberate self-revelation. I have set down the Gospel proofs of each several point, shewing how His self-revelation displays His power, how His power reveals His nature, how His nature is His by birthright, and from His birth comes His title to the name of Son. Thus every whisper of blasphemy is silenced, for the Lord Jesus Christ Himself by the witness of His own mouth has taught us that He is, as His Name, His birth, His nature, His power declare, in the true sense of Deity, very God of very God.
28. While its two predecessors have been devoted to the confirmation of the faith in Christ as Son of God and true God, the eighth book is taken up with the proof of the unity of God, shewing that this unity is consistent with the birth of the Son, and that the birth involves no duality in the Godhead. First it exposes the sophistry with which these heretics have attempted to avoid, though they could not deny, the confession of the real existence of God, Father and Son; it demolishes their helpless and absurd plea that in such passages as, And the multitude of them that believed were one soul and heart [521] , and again, He that planteth and He that watereth are one [522] , and Neither for these only do I pray, but for them also that shall believe on Me through their word, that they may all be one, even as Thou, Father, art in Me, and I in Thee, that they also may be in Us [523] , a unity of will and mind, not of Divinity, is expressed. From a consideration of the true sense of these texts we shew that they involve the reality of the Divine birth; and then, displaying the whole series of our Lord's self-revelations, we exhibit, in the language of Apostles and in the very words of the Holy Spirit, the whole and perfect mystery of the glory of God as Father and as Only-begotten Son. Because there is a Father we know that there is a Son; in that Son the Father is manifested to us, and hence our certainty that He is born the Only-begotten and that He is very God.