20. But the blessed Apostle Paul, taking precaution against this, as we have often shewn, warned us to be on our guard, saying: Take heed lest any man spoil you through philosophy and vain deceit, according to the tradition of men, according to the elements of the world, and not according to Christ, in Whom dwelleth all the fulness of the Godhead bodily [1324] . Therefore we must be on our guard against philosophy, and methods which rest upon traditions of men we must not so much avoid as refute. Any concession that we make must imply not that we are out-argued but that we are confused, for it is right that we, who declare that Christ is the power of God and the wisdom of God, should not flee from the doctrines of men, but rather overthrow them; and we must restrain and instruct the simple-minded lest they be spoiled by these teachers. For since God can do all things, and in His wisdom can do all things wisely, for neither is His purpose unarmed with power nor His power unguided by purpose, it behoves those who proclaim Christ to the world, to face the irreverent and faulty doctrines of the world with the knowledge imparted by that wise Omnipotence, according to the saying of the blessed Apostle: For our weapons are not carnal but powerful for God, for the casting down of strongholds, casting down reasonings and every high thing which is exalted against the knowledge of God [1325] . The Apostle did not leave us a faith which was bare and devoid of reason; for although a bare faith may be most mighty to salvation, nevertheless, unless it is trained by teaching, while it will have indeed a secure retreat to withdraw to in the midst of foes, it will yet be unable to maintain a safe and strong position for resistance. Its position will be like that which a camp affords to a weak force after a flight; not like the undismayed courage of men who have a camp to hold. Therefore we must beat down the insolent arguments which are raised against God, and destroy the fastnesses of fallacious reasoning, and crush cunning intellects which hit themselves up to impiety, with weapons not carnal but spiritual, not with earthly learning but with heavenly wisdom; so that in proportion as divine things differ from human, so may the philosophy of heaven surpass the rivalry of earth.
21. Accordingly let misbelief abandon its efforts; let it not think, because it does not understand, that we deny a truth which, in fact, we alone rightly understand and believe. For while we declare in so many words that He was born, nevertheless we do not assert that He was ever not born [1326] . For it is not the same thing to be not born and to be born: since the latter term expresses origin derived from some other, the former origin derived from none. And it is one thing to exist always, as the Eternal, without any source of being, and another to be co-eternal with a Father, having Him for the Source of being. For where a father is the source of being, there also is birth; and further, where the Source of being is eternal, the birth also is eternal: for since birth comes from the source of being, birth which comes from an eternal Source of being must be eternal. Now everything which always exists, is also eternal. But nevertheless, not everything which is eternal is also not born; since that which is born from eternity has eternally the character of having been born; but that which is not born is ingenerate as well as eternal. But if that which has been born from the Eternal is not born eternal, it will follow that the Father also is not an eternal Source of being. Therefore if any measure of eternity is wanting to Him Who has been born of the eternal Father, clearly the very same measure is wanting to the Author of His being; since what belongs in an infinite degree to Him Who begets, belongs in an infinite degree to Him also Who is born. For neither reason nor intelligence allows of any interval between the birth of God the Son and the generation by God the Father; since the generation consists in the birth, and the birth in the generation. Thus each of these events coincides exactly with the other; neither took place unless both took place. Therefore that which owes its existence to both these events cannot be eternal unless they both are eternal; since neither of the two correlatives, apart from the other, has any reality, because it is impossible for one to exist without the other.
22. But some one, who cannot receive this divine mystery, will say, "Everything which has been born, once was not; since it was born in order that it might come into existence."
23. But does any one doubt that all human beings that have been born, at one time were not? It is, however, one thing to be born of some one who once was not, and another to be born of One Who always is. For every state of infancy, since previously it had no existence, began from some point of time. And this again, growing up into childhood, still later urges on youth to fatherhood. Yet the man was not always a father, for he advanced to youth through boyhood, and to boyhood through original infancy. Therefore he who was not always a father, also did not always beget: but where the Father is eternal, the Son also is eternal. And so if you hold, whether by argument or by instinct, that God, in the mystery of our knowledge of Whom one property is that He is Father, was not always the Father of the begotten Son, you hold also, as a matter of understanding and of knowledge, that the Son, Who was begotten, did not always exist. But if the property of fatherhood be co-eternal with the Father, then necessarily also the property of sonship must be co-eternal with the Son. And how will it square with our language or our understanding to maintain that He was not before He was born, Whose property it is that He always was what He has been born.
24. And so God Only-begotten, containing in Himself the form and image of the invisible God, in all things which are properties of God the Father is equal to Him by virtue of the fulness of true Godhead in Himself. For, as we have shewn in the former books, in respect of power and veneration He is as mighty and as worthy of honour as the Father: so also, inasmuch as the Father is always Father, He too, inasmuch as He is the Son, possesses the like property of being always the Son. For according to the words spoken to Moses, He Who is, hath sent Me unto you [1327] , we obtain the unambiguous conception that absolute being belongs to God; since that which is, cannot be thought of or spoken of as not being. For being and not being are contraries, nor can these mutually exclusive descriptions be simultaneously true of one and the same object: for while the one is present, the other must be absent. Therefore, where anything is, neither conception nor language will admit of its not being. When our thoughts are turned backwards, and are continually carried back further and further to understand the nature of Him Who is, this sole fact about Him, that He is, remains ever prior to our thoughts; since that quality, which is infinitely present in God, always withdraws itself from the backward gaze of our thoughts, though they reach back to an infinite distance. The result is that the backward straining of our thoughts can never grasp anything prior to God's property of absolute existence; since nothing presents itself, to enable us to understand the nature of God, even though we go on seeking to eternity, save always the fact that God always is. That then which has both been declared about God by Moses, that of which our human intelligence can give no further explanation; that very quality the Gospels testify to be a property of God Only-begotten; since in the beginning was the Word, and since the Word was with God, and since He was the true Light, and since God Only-begotten is in the bosom of the Father [1328] , and since Jesus Christ is God over all [1329] .
25. Therefore He was, and He is, since He is from Him Who always is what He is. But to be from Him, that is to say, to be from the Father, is birth. Moreover, to be always from Him, Who always is, is eternity; but this eternity is derived not from Himself, but from the Eternal. And from the Eternal nothing can spring but what is eternal: for if the Offspring is not eternal, then neither is the Father, Who is the source of generation, eternal. Now since it is the special characteristic of His being that His Father always exists, and that He is always His Son, and since eternity is expressed in the name He that is, therefore, since He possesses absolute being, He possesses also eternal being. Moreover, no one doubts that generation implies birth, and that birth points to one existing from that time forth, and not to one who does not continue. Furthermore, there can be no doubt that no one who already was in existence could be born. For no cause of birth can accrue to Him, Who of Himself continues eternal. But God Only-begotten, Who is the Wisdom of God, and the Power and the Word of God, since He was born, bears witness to the Father as the source of His being. Since He was born of One, Who eternally exists, He was not born of nothing. Since He was born before times eternal, His birth must necessarily be prior to all thought. There is no room for the verbal quibble, "He was not, before He was born." For if He is within the range of our thought, in the sense that He was not before He was born, then both our thought and time are prior to His birth; since everything which once was not, is within the compass of thought and time, by the very meaning of the assertion that it once was not, which separates off, within time, a period when it did not exist. But He is from the Eternal, and yet has always been; He is not ingenerate, yet never was non-existent; since to have always been transcends time, and to have been born is birth.
26. And so we confess that God Only-begotten was born, but born before times eternal: since we must make our confession within such limits as the express preaching of Apostles and Prophets assigns to us; though at the same time human thought cannot grasp any intelligible idea of birth out of time, since it is inconsistent with the nature of earthly beings that any of them should be born before all times. But when we make this assertion, how can we reconcile with it, as part of the same doctrine, the contradictory statement that before His birth He was not, when according to the Apostle He is God Only-begotten before times eternal? If, therefore, the belief that He was born before times eternal is not only the reasonable conclusion of human intelligence, but the confession of thoughtful faith, then, since birth implies some author of being, and what surpasses all time is eternal, and whatever is born before times eternal transcends earthly perception, we are certainly exalting by impious self-will a notion of human reason, if we maintain in a carnal sense that before He was born He was not, since He is born eternal, beyond human perception or carnal intelligence. And again, whatever transcends time is eternal.
27. For we can embrace all time in imagination or knowledge, since we know that what is now to-day, did not exist yesterday, because what was yesterday is not now; and on the other hand what is now, is only now and was not also yesterday. And by imagination we can so span the past that we have no doubt that before some city was founded, there existed a time in which that city had not been founded. Since, therefore, all time is the sphere of knowledge or imagination, we judge of it by the perceptions of human reason; hence we are considered to have reasonably asserted about anything, "It was not, before it was born," since antecedent time is prior to the origin of every single thing. But on the other hand, since in things of God, that is to say, in regard to the birth of God, there is nothing that is not before time eternal: it is illogical to use of Him the phrase "before He was born," or to suppose that He Who possesses before times eternal the eternal promise, is merely (in the language of the blessed Apostle [1330] ) in hope of eternal life, which God Who cannot lie has promised before times eternal, or to say that once He was not. For reason rejects the notion that He began to exist after anything, Who, so we must confess, existed before times eternal.