Ἅγιος ἅγιος ἅγιος κύριος

Those who say the Lord is ten thousand times holy and those who dare to misinterpret this are clearly refuted by the [verse]: "I have sought out your countenance, your countenance, o Lord, I shall seek, do not turn your countenance from me."¹ It announces the Holy Trinity. Also the [verse] "sacrifice to the Lord the sacrifice of praise, and render to the highest your prayers," and that which follows.² And through these and through many other [passages] the Old [Testament] proclaims that it indicates the rule not of one person but of three hypostases on the one hand and of one essence on the other.
Those who say "holy is the crucified one," let them be gagged by the [verse]: "my soul thirsted after God, the powerful, the living."³