Does it matter whether they're sincere or not? In the passage below, taken from Matthew 7, sincerity isn't mentioned once. If someone's marriage is ruined, their children driven away, I may have have great motives, but if the results are evil, how can I be good? And if I prophesy incorrect dates that cause others to ruin their lives, plan poorly, make poor investments and not educating themselves...
Aren't these evil fruits?
OR...if I, without any authority, cause someone to die because I guess concerning a doctrine that causes someone to refrain from lifegiving blood...
Isn't that evil fruit?
Where does the Lord mention sincerity?
15 Beware of false prophets which come to you in sheep's clothing, but inwardly they are ravening wolves.
16 Ye shall know them by their fruits. ...
18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name [and]...done many wonderful works?
23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.