Theodoret of Cyrus: The Death of Christ Guarantees the Future

He recalls also the Lord's passion, guaranteeing the future from what has already been done by him. He gave himself for us so as to redeem us from all iniquity and purify for himself a people of his own devoted to good deeds (v.14): this is the reason he accepted death for the sake of us all, to destroy the tyrranny of sin, free us from that harsh servitude and make his own people both lover and devotee of praiseworthy actions.

- Theodoret of Cyrus (around A.D. 393 to around A.D. 457), Commentary on Titus, Chapter 2, in Theodoret of Cyrus, Commentary on the Letters of St. Paul, Volume 2, p. 256 (2001), Robert C. Hill translator.