4 It is such whom the apostle foresaw through the Holy Spirit, when he said: “For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears; and they shall turn away their ears from the truth, and shall be turned unto fables.” For that mentioning of secrecy and theft, whereof it is said, “Partake with pleasure of hidden bread and the sweetness of stolen waters,” creates an itching in those who listen with ears that are lusting after spiritual fornication, just as by a kind of itching also of desire in the flesh the soundness of chastity is corrupted.
Hear, therefore, how the apostle foresaw such things, and gave salutary admonition about avoiding them, when he said, “Shun profane novelties of words; for they increase unto much ungodliness, and their speech insinuates itself as does a cancer.” He did not say novelties of words merely; but added, “profane.” For there are also novelties of words in perfect harmony with religious doctrine, as is told us in Scripture of the very name of Christians, when it began to be used. For it was in Antioch that the disciples were first called Christians after the Lord's ascension, as we read in the Acts of the Apostles: and certain houses were afterwards called by the new names of hospices and monasteries; but the things themselves existed prior to their names, and are confirmed by religious truth, which also forms their defense against the wicked.
In opposition also to the impiety of Arian heretics, they coined the new term, Patris Homousios; but there was nothing new signified by such a name; for what is called Homousios is just this: “I and my Father are one,” to wit, of one and the same substance. For if every novelty were profane, as little should we have it said by the Lord, “A new commandment I give unto you;” nor would the Testament be called New, nor the new song be sung throughout the whole earth. But there is profanity in the novelties of words, when it is said by “the foolish and audacious woman, Come and enjoy the tasting of hidden bread, and the sweetness of stolen waters.”
From such enticing words of false science the apostle also gives his prohibitory warning, in the passage where he says, “O Timothy, keep that which is committed to your trust, avoiding profane novelties of expression, and oppositions of science falsely so called; which some professing, have erred concerning the faith.” For there is nothing that these men so love as to profess science, and to deride as utter silliness faith in those verities which the young are enjoined to believe.
Source: Tractates on the Gospel of John (New Advent)