For that the “Trisagium” refers not to the Son alone Vid. Epist. ad Jordan., but to the Holy Trinity, the divine and saintly Athanasius and Basil and Gregory, and all the band of the divinely-inspired Fathers bear witness: because, as a matter of fact, by the threefold holiness the Holy Seraphim suggest to us the three subsistences of the superessential Godhead. But by the one Lordship they denote the one essence and dominion of the supremely-divine Trinity. Gregory the Theologian of a truth says Orat. 42. at the beginning., “Thus, then, the Holy of Holies, which is completely veiled by the Seraphim, and is glorified with three consecrations, meet together in one lordship and one divinity.” This was the most beautiful and sublime philosophy of still another of our predecessors.