Euthymius Zigabenus, Panoplia Dogmatica; Theodoretus, Historia Religiosa

is proper to every; or if any such thing at all, was made a sign of the apprehension of the Father patros; through the same signs he will find also the word subsisting from him; for just as we understood the word analogously, we knew of the underlying nature; in the same way, we will also be led to the understanding concerning the Spirit pneuma, viewing certain shadows and imitations of the ineffable power in the nature that is among us. But for us, the spirit is a drawing of air; an alien thing, necessarily drawn and poured forth for the constitution of the body; just as at the time of the utterance of the word, a voice comes to be, manifesting the power of the word in itself. But in the case of the divine nature, it was deemed pious that the Spirit of God Theou exists; just as it was given, and that the Word of God Theou exists; because the Word of God Theou must not be more lacking than our word; if indeed this one, being contemplated after the Spirit, were believed to be without the Spirit. But it is not godly to think that any alien thing and one having similarity to our spirit is an influx from without into the divine, and that a spirit comes to be in it; but as, when we heard of the Word, we did not think the Word was an insubstantial thing; nor one coming to be through learning; nor appearing through a voice; nor dissolving after being brought forth; nor suffering any other such things as are observed concerning our word; but subsisting essentially, volitional, and active, and all-powerful; so also, having learned of the Spirit of God Theou, which accompanies the Word and manifests His activity, we do not think of it as an incorporeal breath; for then the majesty of the divine power would be brought down to lowliness; if, according to the likeness of ours, the spirit in it were also suspected; but as a substantial power; contemplated in itself, in a distinct subsistence; not able to be separated from God Theou in whom it is; or from the Word of God Theou which it accompanies; nor poured out into the insubstantial; but according to the likeness of the Word of God Theou, according to subsistence