I found it on Spirit Daily actually.
It's goes along with the stuff I often write about - especially as it concerns Catholic soothsayers, mystics, locutionists, and prophets.
The renowned mystical theologian Father Augustin Poulain, in his classic, The Graces of Interior Prayer, said:
"When a seer wishes to be believed on his bare word, we can generally get rid of him by saying: 'You assure me that God speaks by your mouth. I have no right to believe you unless you prove it. What sign do you bring?' In his ingenuousness he had not expected this question, and retires abashed."
Beware, said Poulain, of a seer who tells you that Heaven has mentioned or chosen you (as a spiritual director, in the case of a priest).
When a seer has had prophecies that did not materialize, this is most certainly a warning signal. The person who mouths a false prediction or posits dates is what Scripture calls "presumptuous." Nor are we to become overly attracted and attached to alleged mystics (and hostile to those who differ). Fanaticism, cult, and rancor are bad fruits for certain (as opposed to heartsease, patience, and joy).
Imagination? "When people strongly desire a thing, the imagination makes them fancy they see or hear it, just as when one's mind is set on a subject all day, one dreams of it at night," said Teresa of Avila. The evil, she says, is not usually in the vision so much as in the person.
At the same time (here comes that balance again -- or is it a tightrope?): there are those too disposed toward skepticism and even caustic disregard due to a mechanistic mindset nurtured strongly by the current educational culture.
If we are humble, said Saint Teresa, a vision, whatever the source, will do us no harm. "The good or the evil is not in the vision," she said, "but in him to whom it is given, and who does not profit by it in humility." - Read the rest here.
When the seer gets mad because you don't believe him, or when he claims as proof that he is right by reminded his critics of what he was right about in the past ... I think that's a fairly certain sign he's self-promoting as well.