What is written below that “the Law and the Prophets were until John,” [Matt 11:13] is said, because there should be no prophecy concerning Christ after He was come. Prophets indeed there have been and are, but not prophesying of Christ, rather interpreting the things which had been prophesied of Christ by the ancients, that is by the doctors of the Churches. For no man can unfold prophetic meaning, but the Spirit of prophecy. The Lord then knowing that there should be false teachers, warns them of divers heresies, saying, “Take heed of false prophets.”
And forasmuch as they would not be manifest Gentiles, but lurk under the Christian name, He said not ‘See ye,’ but, “Take heed.” For a thing that is certain is simply seen, or looked upon; but when it is uncertain it is watched or narrowly considered. Also He says “Take heed,” because it is a sure precaution of security to know him whom you avoid. But his form of warning, “Take heed,” does not imply that the Devil will introduce heresies against God’s will, but by His permission only; but because He would not choose servants without trial, therefore He sends them temptation; and because He would not have them perish through ignorance, He therefore warns them before hand.
Also that no heretical teacher might maintain that He spoke here of Gentile and Jewish teachers and not of them, He adds, “who come to you in sheep’s clothing.” Christians are called sheep, and the sheep’s clothing is a form of Christianity and of feigned religion. And nothing so casts out all good as hypocrisy; for evil that puts on the semblance of good, cannot be provided against, because it is unknown. Again, that the heretic might not allege that He here speaks of the true teachers which were yet sinners, He adds, “But inwardly they are ravening wolves.” But Catholic teachers should they indeed have been sinners, are spoken of as servants of the flesh, yet not as ravening wolves, because it is not their purpose to destroy Christians.
Clearly then it is of heretical teachers that He speaks; for they put on the guise of Christians, to the end they may tear in pieces the Christian with the wicked fangs of seduction. Concerning such the Apostle speaks, “I know that after my departure there will enter among you grievous wolves, not sparing the flock.” [Acts 20:29]
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).