Never trust a prophet.
A prophet's job is to convince you that you are worse off than you really are, and to use that feeling to convince you to act in such a way that it benefits them.
So never trust a rich prophet, especially. They are even more scoundrels than your run-of-the-mill prophet.
View evidence carefully. Some prophets tart themselves up by co-opting language and mannerisms from more respectable fields. Their bottom line, though, is to believe them. That's the hallmark of a prophet.
And prophets who claim exclusive connection to supernatural sources? Oh dear, those are the worst!