We must also remember that serious error can be extremely subtle. False teachers don't wear a sign proclaiming who they are. They disguise themselves as apostles of Christ (2 Corinthians 11:13). "And no wonder, for even Satan disguises himself as an angel of light. Therefore it is not surprising if his servants also disguise themselves as servants of righteousness" (vv. 14-15).
In view of the current hunger for ecumenical compromise, nothing is more desperately needed in the church right now than a new movement to reemphasize the fundamental articles of the faith.