When teachers continually change their views—certain, at last they have found correct ones (until the next ones)—you’re advised by Peter to watch out!
Here is what he wrote (speaking of how such people handle Paul’s writings):
The untaught and unstable twist them to their own destruction as they do with the rest of the Scriptures (2 Peter 3:16, HCSB)
There are two crucial words in this sentence: “untaught” and “unstable.”
The unstable are frequently also the untaught. They launch out on their own, unaware of the difficulties involved in accurate teaching, to set others straight—even when their own views are far from correct. The obvious indication of a person like this is his instability. He is always changing his views at each juncture, as one such counselor does, publicly exclaiming to all and sundry “At last I’ve found the truth” (or words to that effect)! Watch out for people like this!