Theophylact of Ohrid, on Jude 1:4

“For certain men are secretly entered in, (who were written of long ago unto this judgment,) ungodly men, turning the grace of our Lord God into riotousness, and denying the only sovereign Ruler, and our Lord Jesus Christ.”

“He exhorts those who once acknowledged our Lord Jesus Christ as Savior and believed in Him, to contend for the faith. For if we have accepted the incarnate Word and yet say that He Who is from the Father before the ages is one, and He Who is from the Mother is another, and that He is a separate person, then how do we not deny the one Lord and Master? For the Lord Jesus is one by the union of the economy; because the pre-eternal Word of God and God, having flesh grafted into the glory of the Godhead, which He assumed from the Holy Virgin, from the very conception, is one and the same Master of all.”

Imported from an open dataset — not yet checked against the printed edition.