I think that is where the Holy Spirit comes into play, to have discernment about the nature of a manifestation.   I would not automatically dismiss a manifestation though.  Ecclesiastes was written by King Solomon, who although of possessed great wisdom for a time, was no prophet.  He was not the most spiritual of men.  It appears that he didn't believe in an afterlife from Eccl. 9:5.

Ruby


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http://www.fivedoves.com/letters/dec2012/maryw1229.htm
The Bible says:  "For the living know that they shall die:  but the dead know not any thing, neither have they any more reward; for the memory of them is forgotten."  Ecclesiastes 9:5.  Evil angels will come to us in the form of dead loved ones...  To deceive if possible the very elect:  "And no marvel; for Satan himself is transformed into an angel of light."  2 Corinthians 11:14.  Beware.  
 
Mary Wiest