John Chrysostom

"Speaking lies in hypocrisy." This implies that they utter not these falsehoods through ignorance and unknowingly, but as acting a part, knowing the truth, but "having their conscience seared," that is, being men of evil lives.

But why does he speak only of these heretics? Christ had before said, "Offenses must need come" (Matt. xviii. 7), and he had predicted the same in his parable of the sower, and of the springing up of the tares. But here admire with me the prophetic gift of Paul, who, before the times in which they were to appear, specifies the time itself. As if he had said, Do not wonder, if, at the commencement of the faith, some endeavor to bring in these pernicious doctrines; since, after it has been established for a length of time, many shall depart from the faith.