I am sure we all knows these people. They are ministers, teachers, pastors, etc... that are 'called' to the ministry question is, "By who?" (They don't have to necessarily be leaders but they tend to do more damage)
The Bible says:
Proverbs 18:16
A man's gift maketh room for him, and bringeth him before great men.
I know that if we are gifted by God he will make sure to put us in the right places. Unfortunately some seem to have the gift of 'opening doors' for themselves.
People who watch and listen will learn about these people long before others. Problem is the damage is done and is usually extensive. They fall and their ministries crumble and those who placed them above reproach end up being distroyed but these people. They end up hating God and the church because they feel so betrayed by these types.
These people usually do not take correction from others or from God. The Bible states:
Hebrews 12:8 But if ye be without chastisement, whereof all are partakers, then are ye bastards, and not sons.
In judgement they are going to be dissappointed:
Matthew 7:22-24
22Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
23And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
24Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock:
Problem is when you know these people for what they are you have to be very careful how to approach and what to do. It is hard to sit back and watch them fool others.