1 Corinthians 11:19

19. For there must be also heresies He had previously spoken of divisions (1 Corinthians 11:18.) Now he uses the term heresies, with the view of amplifying the more, as we may infer, too, from the word also, for it is added for the sake of amplification. (προς αὔξησιν.) It is well known in what sense the ancients used those two terms, and what distinction they made between Heretics and Schismatics. Heresy they made to consist in disagreement as to doctrine, and schism, on the contrary, in alienation of affection, as when any one withdrew from the Church from envy, or from dislike of the pastors, or from ill nature. It is true, that the Church cannot but be torn asunder by false doctrine, and thus heresy is the root and origin of schism, and it is also true that envy or pride is the mother of almost all heresies, but at the same time it is of advantage to distinguish in this way between these two terms.

But let us see in what sense Paul employs them. I have already expressed my disapprobation of those who explain heresy as meaning the setting up of a separate table, inasmuch as the rich did not partake of their Supper along with the poor; for he had it in view to point out something more hateful. But without mentioning the opinions of others, I take schism and heresy here in the way of less and greater. Schisms, then, are either secret grudges — when we do not see that agreement which ought to subsist among the pious — when inclinations at variance with each other are at work — when every one is mightily pleased with his own way, and finds fault with everything that is done by others. Heresies are when the evil proceeds to such a pitch that open hostility is discovered, and persons deliberately divide themselves into opposite parties. Hence, in order that believers might not feel discouraged on seeing the Corinthians torn with divisions, the Apostle turns round this occasion of offense in an opposite direction, intimating that the Lord does rather by such trials make proof of his people’s constancy. A lovely consolation! “So far, says he, should we be from being troubled, or cast down, when we do not see complete unity in the Church, but on the contrary some threatenings of separation from want of proper agreement, that even if sects should start up, we ought to remain firm and constant. For in this way hypocrites are detected — in this way, on the other hand, the sincerity of believers is tried. For as this gives occasion for discovering the fickleness of those who were not rooted in the Lord’s Word, and the wickedness of those who had assumed the appearance of good men, so the good afford a more signal manifestation of their constancy and sincerity.”