On the ArianSymbol Unoriginate. This term afterwards adopted by them; and why; three senses of it. A fourth sense. Unoriginate denotes God in contrast to His creatures, not to His Son; Father the scriptural title instead; Conclusion
28 This in fact was the reason, when the unsound nature of their phrases had been exposed at that time, and they were henceforth open to the charge of irreligion, that they proceeded to borrow of the Greeks the term Unoriginate, that, under shelter of it, they might reckon among the things originated and the creatures, that Word of God, by whom these very things came to be; so unblushing are they in their irreligion, so obstinate in their blasphemies against the Lord. If then this want of shame arises from ignorance of the term, they ought to have learned of those who gave it them, and who have not scrupled to say that even intellect, which they derive from Good, and the soul which proceeds from intellect, though their respective origins be known, are notwithstanding unoriginated, for they understand that by so saying they do not disparage that first Origin of which the others come. This being the case, let them say the like themselves, or else not speak at all of what they do not know. But if they consider they are acquainted with the subject, then they must be interrogated; for the expression is not from divine Scripture, but they are contentious, as elsewhere, for unscriptural positions. Just as I have related the reason and sense, with which the Council and the Fathers before it defined and published 'of the essence,' and 'one in essence,' agreeably to what Scripture says of the Saviour; so now let them, if they can, answer on their part what has led them to this unscriptural phrase, and in what sense they call God Unoriginated? In truth, I am told, that the name has different senses; philosophers say that it means, first 'what has not yet, but may, come to be;' next, 'what neither exists, nor can come into being;' and thirdly, 'what exists indeed, but was neither originated nor had origin of being, but is everlasting and indestructible. ' Now perhaps they will wish to pass over the first two senses, from the absurdity which follows; for according to the first, things that already have come to be, and things that are expected to come to be, are unoriginated; and the second is more absurd still; accordingly they will proceed to the third sense, and use the word in it; though here, in this sense too, their irreligion will be quite as great. For if by unoriginated they mean what has no origin of being, nor is originated or created, but eternal, and say that the Word of God is contrary to this, who comprehends not the craft of these foes of God? Who but would stone such madmen? For, when they are ashamed to bring forward again those first phrases which they fabled, and which were condemned, the wretches have taken another way to signify them, by means of what they call unoriginate. For if the Son be of things originate, it follows, that He too came to be from nothing; and if He has an origin of being, then He was not before His generation; and if He is not eternal, there was once when He was not.
29. If these are their sentiments they ought to signify their heterodoxy in their own phrases, and not to hide their perverseness under the cloke of the Unoriginate. But instead of this, the evil-minded men do all things with craftiness like their father, the devil; for as he attempts to deceive in the guise of others, so these have broached the term Unoriginate, that they might pretend to speak piously of God, yet might cherish a concealed blasphemy against the Lord, and under a veil might teach it to others. However, on the detecting of this sophism, what remains to them? 'We have found another,' say the evildoers; and then proceed to add to what they have said already, that Unoriginate means what has no author of being, but stands itself in this relation to things originated. Unthankful, and in truth deaf to the Scriptures! Who do everything, and say everything, not to honour God, but to dishonour the Son, ignorant that he who dishonours the Son, dishonours the Father. For first, even though they denote God in this way, still the Word is not proved to be of things originated. For again, as being an offspring of the essence of the Father, He is of consequence with Him eternally. For this name of offspring does not detract from the nature of the Word, nor does Unoriginated take its sense from contrast with the Son, but with the things which come to be through the Son; and as he who addresses an architect, and calls him framer of house or city, does not under this designation allude to the son who is begotten from him, but on account of the art and science which he displays in his work, calls him artificer, signifying thereby that he is not such as the things made by him, and while he knows the nature of the builder, knows also that he whom he begets is other than his works; and in regard to his son calls him father, but in regard to his works, creator and maker; in like manner he who says in this sense that God is unoriginate, names Him from His works, signifying, not only that He is not originated, but that He is maker of things which are so; yet is aware withal that the Word is other than the things originate, and alone a proper offspring of the Father, through whom all things came to be and consist.
30. In like manner, when the Prophets spoke of God as All-ruling, they did not so name Him, as if the Word were included in that All; (for they knew that the Son was other than things originated, and Sovereign over them Himself, according to His likeness to the Father); but because He is Ruler over all things which through the Son He has made, and has given the authority of all things to the Son, and having given it, is Himself once more the Lord of all things through the Word. Again, when they called God, Lord of the powers, they said not this as if the Word was one of those powers, but because while He is Father of the Son, He is Lord of the powers which through the Son have come to be. For again, the Word too, as being in the Father, is Lord of them all, and Sovereign over all; for all things, whatsoever the Father has, are the Son's. This then being the force of such titles, in like manner let a man call God unoriginated, if it so please him; not however as if the Word were of originated things, but because, as I said before, God not only is not originated, but through His proper Word is He the maker of things which are so. For though the Father be called such, still the Word is the Father's Image, and one in essence with Him; and being His Image, He must be distinct from things originated, and from everything; for whose Image He is, His property and likeness He has: so that he who calls the Father unoriginated and almighty, perceives in the Unoriginated and the Almighty, His Word and His Wisdom, which is the Son. But these wondrous men, and prompt for irreligion, hit upon the term Unoriginated, not as caring for God's honour, but from malevolence towards the Saviour; for if they had regard to honour and reverent language, it rather had been right and good to acknowledge and to call God Father, than to give Him this name; for in calling God unoriginated, they are, as I said before, calling Him from things which came to be, and as a Maker only, that so they may imply the Word to be a work after their own pleasure; but he who calls God Father, in Him withal signifies His Son also, and cannot fail to know that, whereas there is a Son, through this Son all things that came to be were created.
Source: De Decretis (New Advent)