Jude 1:16

These are grumblers, malcontents, following their own sinful desires; they are loud-mouthed boasters, showing favoritism to gain advantage.
(ESV)

Jude does not take it easy with the names he uses to describe these false teachers.  But he desires that the listener be fully aware of the heart of the false teacher.

Ask yourself though, do any of these descriptions match you?

I know that for myself, I will go days on end as a grumbler.  It is usually something about work, or something that the boss did.  So I will gripe and complain like the best of them. 

So before you start nailing false prophets, you may want to get the beam out of your eye.