The term “mark” means to “watch out for” (ESV) those who “cause division.” Such divisiveness may be generated by the introduction of false teachings or the pressing of opinions regarding nonessentials within the realm of gospel truth. “Occasions of stumbling” are scandalous actions which precipitate apostasy from the truth resulting in eternal condemnation. These attitudes and actions are contrary to Christian principles and are worthy of discipline.
Wayne Jackson, A New Testament Commentary
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