De Decretis

²² If then any man conceives God to be compound, as accident is in essence, or to have any external envelopement, and to be encompassed, or as if there is anything about Him which completes the essence, so that when we say 'God,' or name 'Father,' we do not signify the invisible and incomprehensible essence, but something about it, then let them complain of the Council's stating that the Son was from the essence of God; but let them reflect, that in thus considering they utter two blasphemies; for they make God corporeal, and they falsely say that the Lord is not Son of the very Father, but of what is about Him. But if God be simple, as He is, it follows that in saying 'God' and naming 'Father,' we name nothing as if about Him, but signify his essence itself. For though to comprehend what the essence of God is be impossible, yet if we only understand that God is, and if Scripture indicates Him by means of these titles, we, with the intention of indicating Him and none else, call Him God and Father and Lord. When then He says, 'I am that I am,' and 'I am the Lord God,' or when Scripture says, 'God,' we understand nothing else by it but the intimation of His incomprehensible essence Itself, and that He Is, who is spoken of. Therefore let no one be startled on hearing that the Son of God is from the Essence of the Father; but rather let him accept the explanation of the Fathers, who in more explicit but equivalent language have for 'from God?' written 'of the essence.' For they considered it the same thing to say that the Word was 'of God?' and 'of the essence of God,' since the word 'God,' as I have already said, signifies nothing but the essence of Him Who Is. If then the Word is not in such sense from God, as a son, genuine and natural, from a father, but only as creatures because they are framed, and as 'all things are from God,' then neither is He from the essence of the Father, nor is the Son again Son according to essence, but in consequence of virtue, as we who are called sons by grace. But if He only is from God, as a genuine Son, as He is, then the Son may reasonably be called from the essence of God.

23. Again, the illustration of the Light and the Radiance has this meaning. For the Saints have not said that the Word was related to God as fire kindled from the heat of the sun, which is commonly put out again, for this is an external work and a creature of its author, but they all preach of Him as Radiance, thereby to signify His being from the essence, proper and indivisible, and His oneness with the Father. This also will secure His true unchangableness and immutability; for how can these be His, unless He be proper Offspring of the Father's essence? For this too must be taken to confirm His identity with His own Father. Our explanation then having so religious an aspect, Christ's enemies should not be startled at the 'One in essence,' either, since this term also has a sound sense and good reasons. Indeed, if we say that the Word is from the essence of God (for after what has been said this must be a phrase admitted by them), what does this mean but the truth and eternity of the essence from which He is begotten? For it is not different in kind, lest it be combined with the essence of God as something foreign and unlike it. Nor is He like only outwardly, lest He seem in some respect or wholly to be other in essence, as brass shines like gold and silver like tin. For these are foreign and of other nature, are separated off from each other in nature and virtues, nor is brass proper to gold, nor is the pigeon born from the dove; but though they are considered like, yet they differ in essence. If then it be thus with the Son, let Him be a creature as we are, and not One in essence; but if the Son is Word, Wisdom, Image of the Father, Radiance, He must in all reason be One in essence. For unless it be proved that He is not from God, but an instrument different in nature and different in essence, surely the Council was sound in its doctrine and correct in its decree.

24. Further, let every corporeal reference be banished on this subject; and transcending every imagination of sense, let us, with pure understanding and with mind alone, apprehend the genuine relation of son to father, and the Word's proper relation towards God, and the unvarying likeness of the radiance towards the light: for as the words 'Offspring' and 'Son' bear, and are meant to bear, no human sense, but one suitable to God, in like manner when we hear the phrase 'one in essence,' let us not fall upon human senses, and imagine partitions and divisions of the Godhead, but as having our thoughts directed to things immaterial, let us preserve undivided the oneness of nature and the identity of light; for this is proper to a son as regards a father, and in this is shown that God is truly Father of the Word. Here again, the illustration of light and its radiance is in point. Who will presume to say that the radiance is unlike and foreign to the sun? Rather who, thus considering the radiance relatively to the sun, and the identity of the light, would not say with confidence, 'Truly the light and the radiance are one, and the one is manifested in the other, and the radiance is in the sun, so that whoso sees this, sees that also?' but such a oneness and natural property, what should it be named by those who believe and see aright, but Offspring one in essence? And God's Offspring what should we fittingly and suitably consider, but Word, and Wisdom, and Power? Which it were a sin to say was foreign to the Father, or a crime even to imagine as other than with Him everlastingly. For by this Offspring the Father made all things, and extended His Providence unto all things; by Him He exercises His love to man, and thus He and the Father are one, as has been said; unless indeed these perverse men make a fresh attempt, and say that the essence of the Word is not the same as the Light which is in Him from the Father, as if the Light in the Son were one with the Father, but He Himself foreign in essence as being a creature. Yet this is simply the belief of Caiaphas and the Samosatene, which the Church cast out, but these now are disguising; and by this they fell from the truth, and were declared to be heretics. For if He partakes in fullness the light from the Father, why is He not rather that which others partake, that there be no medium introduced between Him and the Father? Otherwise, it is no longer clear that all things were generated by the Son, but by Him, of whom He too partakes. And if this is the Word, the Wisdom of the Father, in whom the Father is revealed and known, and frames the world, and without whom the Father does nothing, evidently He it is who is from the Father: for all things originated partake of Him, as partaking of the Holy Ghost. And being such, He cannot be from nothing, nor a creature at all, but rather a proper Offspring from the Father, as the radiance from light.