John MacArthur writes:
Truth is under heavy attack, and there are too few courageous warriors who are willing to fight. When we stand before the judgment seat of Christ, believers from this generation will not be able to justify their apathy by complaining that the strife of conflict over truth just seemed “too negative” for the kind of culture we lived in—or that the issues were “merely doctrinal” and therefore not worth the effort.
Remember, Christ rebuked the churches in Revelation 2–3 who had tolerated false teachers in their midst (2:14–16; 20–23). He expressly commended the Ephesian church for examining the claims of certain false apostles and exposing them as liars (2:2). Churches have a clear duty to guard the faith against false teachers who infiltrate. Christ Himself demands it.