ACC ~ Titus 1 v1a
APOSTOLIC DIGNITY ESTABLISHED. JEROME: When he says, “An apostle of Jesus Christ,” it seems to be as if he had said, “commanding officer of the praetorian guard of Augustus Caesar, master of the army for Tiberius Caesar.” Just as secular judges are seen as more noble in accordance with the kings whom they serve and are assigned a name from the dignity by which they are elevated, so by establishing his great dignity among Christians as an apostle, he has designated himself with the title of apostle of Christ, that he might strike awe into his readers by the authority of the name. Thereby he indicates that all who believe in Christ are to be in submission to him. COMMENTARY ON TITUS.
FATHER AND SON TOGETHER. THEODORET OF CYR: The opening of every one of his letters is distinguished by the divine apostle with this address. At one time it is “Paul a servant of Jesus Christ called to be an apostle.” At another “Paul called to be an apostle of Jesus Christ.” At another “Paul a servant of God and an apostle of Jesus Christ.” And suiting his benediction to his salutation he deduces it from the same source and links the title of the Son with God the Father, saying “grace to you and peace from God our Father and the Lord Jesus Christ.” LETTERS 146.
2 Tim