Nicene and Post-Nicene Fathers: Series II/Volume XI/John Cassian/Against Nestorius/Book VI/Chapter 18

Chapter XVIII.

He directs his discourse upon his antagonist with whom he is disputing, and begs him to return to his senses. The sacrament of reconciliation is necessary for the lapsed for their salvation.

so, you wretched, insane, obstinate creature, you see that you have utterly upset the whole faith of the Creed, and all that is valuable in our hope and the mysteries. And yet you still dare to remain in the Church: and imagine that you are a priest, though you have denied everything by which you came to be a priest. Return then to the right way, and recover your former mind, return to your senses if you ever had any. Come to your self, if there ever was in you a self to which you can come back. Acknowledge the sacraments of your salvation, by which you were initiated and regenerated. They are of no less use to you now than they were then; for they can now regenerate you by penance, as they then gave you birth through the Font. Hold fast the full scheme of the Creed. Hold the entire truth of the faith. Believe in God the Father: believe in God the Son: in one who begat and one who was begotten, the Lord of all, Jesus Christ; Being of one substance with the Father; Begotten in His divinity; born in the flesh: of twofold birth, yet of but one glory; who Himself creator of all things, was begotten of the Father, and was afterwards born of the Virgin.