"Holy, true," not through participation, but being such in essence. He himself is God the Word, having the key of David. For when the Word became flesh, he opens the Scriptures by this key [Scriptures], which were shut before [his] advent [and] which no one is able to shut by asserting that they have not been fulfilled.
Anonymous Greek Scholiast (possibly drawing from Didymus the Blind), in Fathers of the Church, Vol. 144, Cassiodorus, St. Gregory the Great, and Anonymous Greek Scholia, Writings on the Apocalypse, Scholia 20, p. 121 T.C. Schmidt, Trans.
Alternative translation:
He that is holy, he that is true: This is God the Logos, who is what He is not by participation, but by essence. Who hath the key of David: when the Logos became flesh, through this key he openeth the scriptures, which were sealed before the advent, that no man can shut since he declares them not [yet] fulfilled.
Cassian the Sabaite(?), An Ancient Commentary on the Book of Revelation: a Critical Edition of the Scholia in Apocalypsin, P. Tzamalikos trans. (p. 133)
