D&C 131

The Prophet Joseph Smith taught - 

"The more sure word of prophecy means a man’s knowing that he is sealed up unto eternal life, by revelation and the spirit of prophecy, through the power of the Holy Priesthood."  (Doctrine and Covenants 131:5)

There are scriptural references for individuals where this has taken place.

I've wondered what this would be like, but obviously, I am far from this happening to me.