All novelty in faith is a sure mark of heresy.

Avoid the profane novelty of words, St. Paul says (I Timothy 6:20) ... For if novelty is to be avoided, antiquity is to be held tight to and if novelty is profane, antiquity is sacred.

What, then, shall a Catholic Christian do ... if some novel contagion attempt to infect no longer a small part of the Church alone but the whole Church alike? He shall then see to it that he cleave unto antiquity, which is now utterly incapable of being seduced by any craft or novelty.