Here is a link to an interesting article on false teachers.
http://www.challies.com/articles/lessons-ive-learned-from-false-teachers?utm_content=bufferd243f&utm_medium=social&utm_source=twitter.com&utm_campaign=bufferI thought this paragraph was particularly interesting.
"False teachers cause division within the church and often cause division even among true Christians. Because false teachers tend to remain within the church, and because they claim to be honoring the Bible, they confuse true believers and drive wedges between them.
Amazingly, it is often those who stand fast against falsehood who get labeled as divisive. The church often trusts a smiling false teacher ahead of a frowning defender."