Answer to Eunomius' Second Book
First of all, however, I think it advisable to run briefly over our own doctrinal views and our opponent's disagreement with them, so that our review of the propositions in question may proceed methodically. Now the main point of Christian orthodoxy is to believe that the Only-begotten God, Who is the truth and the true light, and the power of God and the life, is truly all that He is said to be, both in other respects and especially in this, that He is God and the truth, that is to say, God in truth, ever being what He is conceived to be and what He is called, Who never at any time was not, nor ever will cease to be, Whose being, such as it is essentially, is beyond the reach of the curiosity that would try to comprehend it. But to us, as says the word of Wisdom, He makes Himself known that He is “by the greatness and beauty of His creatures proportionately” to the things that are known, vouchsafing to us the gift of faith by the operations of His hands, but not the comprehension of what He is. Whereas, then, such is the opinion prevailing among all Christians, (such at least as are truly worthy of the appellation, those, I mean, who have been taught by the law to worship nothing that is not very God, and by that very act of worship confess that the Only-begotten is God in truth, and not a God falsely so called,) there arose this deadly blight of the Church, bringing barrenness on the holy seeds of the faith, advocating as it does the errors of Judaism, and partaking to a certain extent in the impiety of the Greeks. For in its figment of a created God it advocates the error of the Greeks, and in not accepting the Son it supports that of the Jews. This school, then, which would do away with the very Godhead of the Lord and teach men to conceive of Him as a created being, and not that which the Father is in essence and power and dignity, since these misty ideas find no support when exposed on all sides to the light of truth, have overlooked all those names supplied by Scripture for the glorification of God, and predicated in like manner of the Father and of the Son, and have betaken themselves to the word “ungenerate,” a term fabricated by themselves to throw contempt on the greatness of the Only-begotten God. For whereas an orthodox confession teaches us to believe in the Only-begotten God so that all men should honour the Son even as they honour the Father, these men, rejecting the orthodox terms whereby the greatness of the Son is signified as on a par with the dignity of the Father, draw from thence the beginnings and foundations of their heresy in regard to His Divinity. For as the Only-begotten God, as the voice of the Gospel teaches, came forth from the Father and is of Him, misrepresenting this doctrine by a change of terms, they make use of them to rend the true faith in pieces. For whereas the truth teaches that the Father is from no pre-existing cause, these men have given to such a view the name of “ungeneracy,” and signify the substance of the Only-begotten from the Father by the term “generation,”— then comparing the two terms “ungenerate” and “generate” as contradictories to each other, they make use of the opposition to mislead their senseless followers. For, to make the matter clearer by an illustration, the expressions, He was generated and He was not generated, are much the same as, He is seated and He is not seated, and all such-like expressions. But they, forcing these expressions away from the natural significance of the terms, are eager to put another meaning upon them with a view to the subversion of orthodoxy. For whereas, as has been said, the words “is seated” and “is not seated” are not equivalent in meaning (the one expression being contradictory of the other), they pretend that this formal contradiction in expression indicates an essential difference, ascribing generation to the Son and non-generation to the Father as their essential attributes. Yet, as it is impossible to regard a man's sitting down or not as the essence of the man (for one would not use the same definition for a man's sitting as for the man himself), so, by the analogy of the above example, the non-generated essence is in its inherent idea something wholly different from the thing expressed by “not having been generated.” But our opponents, with an eye to their evil object, that of establishing their denial of the Godhead of the Only-begotten, do not say that the essence of the Father is ungenerate, but, conversely, they declare ungeneracy to be His essence, in order that by this distinction in regard to generation they may establish, by the verbal opposition, a diversity of natures. In the direction of impiety they look with ten thousand eyes, but with regard to the impracticability of their own contention they are as incapable of vision as men who deliberately close their eyes. For who but one whose mental optics are utterly purblind can fail to discern the loose and unsubstantial character of the principle of their doctrine, and that their argument in support of ungeneracy as an essence has nothing to stand upon? For this is the way in which their error would establish itself.
But to the best of my ability I will raise my voice to rebut our enemies' argument. They say that God is declared to be without generation, that the Godhead is by nature simple, and that which is simple admits of no composition. If, then, God Who is declared to be without generation is by His nature without composition, His title of Ungenerate must belong to His very nature, and that nature is identical with ungeneracy. To whom we reply that the terms incomposite and ungenerate are not the same thing, for the former represents the simplicity of the subject, the other its being without origin, and these expressions are not convertible in meaning, though both are predicated of one subject. But from the appellation of Ungenerate we have been taught that He Who is so named is without origin, and from the appellation of simple that He is free from all admixture (or composition), and these terms cannot be substituted for each other. There is therefore no necessity that, because the Godhead is by its nature simple, that nature should be termed ungeneracy; but in that He is indivisible and without composition, He is spoken of as simple, while in that He was not generated, He is spoken of as ungenerate.
Source: Answer to Eunomius' Second Book (New Advent)