Gregory Thaumaturgus

“ Nevertheless it bears that we should not speak of two persons in Christ, lest, by thus acknowledging Him as God, and as in the perfect divinity, and yet speaking of two persons, we should make a Tetrad of the divine persons, counting that of God the Father as one, and that of the Son of God as one, and that of the man as one, and that of the Holy Spirit as one. ”

“ But, again, it bears also against recognising two divine natures, [3] and rather for acknowledging Him to be perfect God in one natural divine perfection, and not in two; for his object is to show that He became incarnate without change, and that He retains the divinity without duplication. [4] Accordingly he says shortly: “And while the affections of the flesh spring, the energy [5] retains the impassibility proper to it. He, therefore, who introduces the (idea of) passion into the energy is impious ”