I think that it is so important to know this. In a time like this of tolerance, listen, false teaching will always cry intolerance. It will always say you are being divisive, you are being unloving, you are being ungracious, because it can only survive when it doesn’t get scrutinized. So it cries against any intolerance. It cries against any examination, any scrutiny—just let’s embrace each other; let’s love each other; let’s put all that behind us.

False doctrine cries the loudest about unity. Listen carefully when you hear the cry for unity, because it may be the cover of false doctrine encroaching. If ever we should follow 1 Thessalonians 5, and examine everything carefully, it’s when somebody is crying unity, love, and acceptance. (Online source)

John MacArthur