Answer to Eunomius' Second Book
What, then, does Eunomius say to this? “If He is imperishable only by reason of the unending in His Life, and ungenerate only by reason of the unbeginning, then wherein He is not imperishable He is perishable, and wherein He is not ungenerate He is generated.” Who conceded to you this, Eunomius, that the imperishability is not to be associated with the whole life of God? Who ever divided that Life into two parts, and then put particular names to each half of the Life, so that to the division which the one name fitted the other could not be said to apply? This is the result of your dialectic sharpness; to say that the Life which has no beginning is perishable, and that what is imperishable cannot be associated with what is unbeginning! It is just as if, when one had said that man was rational, as well as capable of speculation and knowledge, attaching each phrase to the subject of them according to a different application and idea, some one was to jeer, and to go on in the same strain, “If man is capable of speculation and knowledge, he cannot, as regards this, be rational, but wherein he is capable of such knowledge, he is this and this only, and his nature does not admit of his being the other”; and reversely, if rational were made the definition of man, he were to deny in this case his being capable of this speculation and knowledge; for “wherein he is rational, he is proved devoid of mind.” But if the ridiculousness and absurdity in this case is plain to any one, neither in that former case is it at all doubtful. When you have read the passage from the Master, you will find that his childish sophistry will vanish like a shadow. In our case of the definition of man, the capability of knowledge is not hindered by the possession of reason, nor the reason by the capability of knowledge: no more is the eternity of the Divine Life deprived of imperishability, if it be unbeginning, or of beginninglessness, if we recognize its imperishability. This would-be seeker after truth, with the artifices of his dialectic shrewdness, inserts in our argument what comes from his own repertoire; and so he fights with himself and overthrows himself, without ever touching anything of ours. For our position was nothing but this; that the Life as existing without beginning is styled, by means of a fresh Conception, as ungenerate: is styled, I say, not, is made such; and that we mark the Life as going on into infinity with the appellation of imperishable; mark it, I say, as such, not, make it such; and that the result is, that while it is a property of the Divine Life, inherent in the subject, to be infinite in both views, the thoughts associated with that subject are expressed in this way or in that only as regards that particular term which indicates the thought expressed. One thought associated with that life is, that it does not exist from any cause; this is indicated by the term “ungenerate.” Another thought about it is, that it is limitless and endless; this is represented by the word imperishable. Thus, while the subject remains what it is, above everything, whether name or thought, the not being from any cause, and the not changing into the non-existent, are signified by means of the Conception implied in the aforesaid words.
What, then, out of all that we have said, has stirred him up to this piece of childish folly, in which he returns to the charge and repeats himself in these words: “He will, then, be, as unbeginning, at once ungenerate and perishable, and, as unending, at once imperishable and generated.” It is plain to any possessing the least reflection, without our testing this logically, how absurdly foolish it is, or rather, how condemnably blasphemous. By the same argument as that whereby he establishes this union of the perishable and the unbeginning, he can make sport of any proper and worthily conceived name for the Deity. For it is not these two ideas only that we associate with the Divine Life, I mean, the being without beginning, and the not admitting of dissolution; but It is called as well immaterial and without anger, immutable and incorporeal, invisible and formless, true and just; and there are numberless other ways of thinking about the Divine Life, each one of which is announced by an expressive sound with a peculiar meaning of its own. Well, to any name— any name, I mean, expressive of some proper conception of the Deity— it is open for us to apply this method of unnatural union devised by Eunomius. For instance, immateriality and absence of anger are both predicated of the Divine Life; but not with the same thought in both cases; for by the term immaterial we convey the idea of purity from any mixture with matter, and by the term “without anger” the strangeness to any emotion of anger. Now in all probability Eunomius will run trippingly over all this, and have his dance, just as before, upon our words. Stringing together his absurdities in the same way, he will say: “If wherein He is separated from all mixture with matter He is called immaterial, in this respect He will not be without anger; and if by reason of His not indulging in anger He is without anger, it is impossible to attribute to him immateriality, but logic will compel us to admit that, in so far as He is exempt from matter, He is both immaterial and wrathful;” and so you will find the same to be the case in respect to his other attributes. And if you like we will propound another pairing of the same, i.e. His immutability and His incorporeality. For both these terms being used of the Divine Life in a distinct sense, in their case also Eunomius' skill will embellish the same absurdity. For if His being always as He is is signified by the term immutable, and if the term incorporeal represents the spirituality of His essence, Eunomius will certainly say the same here also, that the terms are irreconcilable, and alien to each other, and that the notions which our minds attach to them have no point of contact one with the other; for insofar as God is always the same He is immutable, but not incorporeal; and in regard to the spirituality and formlessness of His essence, while He possesses attributes of incorporeality, He is not immutable; so that it happens that when immutability is considered with respect to the Divine Life, along with that immutability it is established that It is corporeal; but if spirituality is the object of search, you prove that It is at once incorporeal and mutable.
Source: Answer to Eunomius' Second Book (New Advent)