23 But this is not enough. Once the integrity of the faith has been safeguarded, then it is time to guard the proper way of expressing it, lest our careless use of words give rise, God forbid, to false opinions regarding faith in the most sublime things. St. Augustine gives a stern warning about this when he takes up the matter of the different ways of speaking that are employed by the philosophers on the one hand and that ought to be used by Christians on the other. "The philosophers," he says, "use words freely, and they have no fear of offending religious listeners in dealing with subjects that are difficult to understand. But we have to speak in accordance with a fixed rule, so that a lack of restraint in speech on our part may not give rise to some irreverent opinion about the things represented by the words.'' (l0)
Source: Mysterium Fidei (Vatican.va)