Vincent of Lérins

Consequently, to announce to Catholic Christians a doctrine other than that which they have received was never permitted, is nowhere permitted and never will be permitted. It was ever necessary, is everywhere necessary and ever will be necessary that those who announce a doctrine other than that which was received once and for all be anathema. If this be so, is there anyone alive so bold as to preach dogmas other than those taught by the church, or so foolish as to accept doctrines besides those accepted by the church? Crying aloud, crying aloud again and again and again, crying aloud to everyone, always and everywhere throughout his writings, Paul remains this "vessel of election," this "doctor of the Gentiles," this trumpet among the apostles, this herald of the earth, this heaven-conscious man. He is crying aloud that whoever announces a new doctrine is anathema.