“To Titus mine owne Sonne after the common faith, Grace, mercie, and peace from God the Father, and the Lord Iesus Christ our Sauiour.”
1611 King James Version (KJV)
1:4 My own son - Begot in the same image of God, and repaying a paternal with a filial affection. The common faith - Common to me and all my spiritual children.
Tit 1:4 To Titus, [my] own son. Concerning Titus, see topic 9253. The language here shows that he was one of Paul's converts.