St. Cyprian: "Change nothing; be content with tradition.
St. Irenaeus of Lyons: “The preaching of the Church truly continues without change and is everywhere the same. It has the testimony of the Prophets and Apostles and all their disciples.
St. Vincent of Lerins: “Avoid the profane novelty of words,” St. Paul says (1 Timothy 6: 20) . . . For if novelty is to be avoided, antiquity is to be held tight to; and if novelty is profane, tradition is sacred.
St. Cyril of Alexandria: “The ancient doctrines must be confirmed, but novel and absurd inventions must be condemned and cast aside.
Pope St. Leo the Great: “The devil is always discovering something novel against the truth.
St. Vincent of Lerins: “To announce, therefore, to Catholic Christians anything besides that which they have received has never been lawful, is lawful nowhere, and never will be lawful; and to anathematize those who announce anything besides that which has been once received has always been necessary. This being the case, is there anyone of such audacity as to teach other than that which has already been taught in the Church, or anyone of such levity as to receive anything besides that which he has once received from the Church? St. Paul, the teacher of the Gentiles, cries aloud, and he cries out loud again and again, to all men, to all times, and to all places that, if anyone announces a new dogma, let him be anathematized!
Pope St. Innocent I: “Wherefore, by the authority of Apostolic power, We declare inventors of novel notions, which as the Apostle Paul has said are of no edification, but rather are practiced to beget most foolish questions, are to be deprived of the communion of the Church.
St. Vincent of Lerins: “This custom has always prevailed in the Church: that, the more religious a man was, the more promptly did he withstand novel inventions.
St. Ambrose: “We do not innovate anything . . . How is it that novelties are introduced which were never even thought of by our predecessors?
St. Vincent of Lerins: “All novelty in faith is a sure mark of heresy.
St. John Eudes: “Any innovation in matters of faith is extremely pernicious and utterly damnable!
St. Alphunsus Maria Ligouri: “New revelations regarding faith or morals . . . have always been abhorred and challenged in the Church . . . Hence, the Sovereign Pontiffs, the Councils, and the Fathers have been most careful to reject all novelties or new doctrines on matters of faith which differed from those already received.
Pope Benedict XV: “ Let nothing new be introduced, but only what has been handed down.
St. Vincent of Lerins: “Nothing new is to be accepted except what has been handed down by tradition.
Pope St. Simplicus: “Let whoever attempts to disseminate anything other than what we have received be anathema. Let no approach be open to the pernicious plans of undermining, let no pledge of revising any of the old definitions be granted…"