8 For that you may know, that the Bridegroom and the Bride are One according to the Flesh of Christ, not according to His Divinity (for according to His Divinity we cannot be what He is; seeing that He is the Creator, we the creature; He the Maker, we His work; He the Framer, we framed by Him; but in order that we might be one with Him in Him, He vouchsafed to be our Head, by taking of us flesh wherein to die for us); that you may know then that this whole is One Christ, He said by Isaiah, “He has bound a mitre on me as a bridegroom, and clothed me with ornaments as a bride.” He is then at once the Bridegroom and the Bride. That is, the Bridegroom in Himself as the Head, the Bride in the body. “For they two,” says He, “shall be in one flesh; so now they are no more two, but one flesh.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)