False teaching spreads. The New Testament warns us that false teaching spreads like gangrene (2 Timothy 2:17). Churches should draw boundaries for the sake of their health and even their very lives.
False teaching causes controversy and distracts from ministry. Paul warned Timothy to “have nothing to do with “foolish controversies” (2 Timothy 2:23; cf. Titus 3:9 . There comes a point at which it is no longer wise for a church to continue arguing over certain controversies. Clear boundaries keep a church from getting bogged down in endless quarrels and becoming distracted from its main work.
Jesus holds us responsible for sound doctrine. The New Testament holds church leaders—and whole churches (Galatians 1)—responsible to silence false teaching in the church (Titus 1:10-11). Jesus rebukes churches that tolerated the presence of false teachers (Rev. 2-3), including the church at Pergamum, which merely had among them people who held to certain false teachings.
Find more great resources for church health from Mark Dever and 9Marks Ministries at www.9marks.org