Euthymius Zigabenus, Panoplia Dogmatica; Theodoretus, Historia Religiosa

Just as fire is described to the dead and brings life, so too does the Son bring life to whom He wishes. And [it is written] that the Spirit is life-giving; but as for how the Godhead possesses the mastery of all things, [as] the source of the God-bearing deity, I do not believe it is even possible to say in how many places of theology this is spoken of regarding the Father and the Son, and through the fire. But the Spirit is also this.

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Regarding the holy Spirit, in theology [He is] distinguished yet at once united, according to the great Athanasius, and that what the scriptures say concerning the Father, they say again concerning the Son and concerning the holy Spirit, thus [there is] one faith for them, [one] deity.

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As the fire said in Isaiah, these things also John says, that the Son also said. In the Acts, Paul says that the Spirit said plainly. How was it written in Isaiah: I saw the Lord sitting upon a throne, high and lifted up; and the house was full of His glory; and the seraphim stood around Him; six wings to one; and six wings to the other; and with two wings they covered their faces; and with two [they covered] their feet; and with two they flew; and one called to the other: Holy, holy, holy is the Lord of Sabaoth; the whole earth is full of His glory. And furthermore: I heard the voice of Him saying, Whom shall I send, and who will go to this people? And I said, Behold I [am here]; send me. And He said to me: Go to the people; and I said to Him: You shall hear with hearing and not understand; and looking you shall look and not see; for the heart of this people has grown fat; and they heard heavily with their ears; and they closed their eyes; lest they should see with their eyes; and hear with their ears; and understand with their heart; and turn, and I shall heal them. Because the apostle John says: For this reason the Jews could not believe, because Isaiah said concerning them: Their eyes have been blinded, and their heart has been hardened, so that they should not see with their