Sorry Deanna,
I believe that what we were trying to say is that although an experience can be had/experienced by an individual, and can be undeniably true/factual for that individual... it is usually something which cannot be "scientifically" proven for the masses whom don't believe in the discussions that we so "regularly" embark upon. Suffice it to say... what may be "concrete proof of the existence of the afterlife" to you... May in fact, not hold as "concretely" within the scientific community with regards to the scientific/philosophic disection that inevitably occurs within these scientific communities... (i.e. proofs, theorems, and the like, require immense amounts of logical deduction/evidential gatherings)... It's not to say that what you experienced wasn't true or didn't happen... it's to say that, in reference to what you previously stated regarding it being "concrete proof for the existence of the afterlife", it may in fact be concrete proof to you from your vantage point, but in order for it to be concrete proof to all others "not" within your vantage point, that it requires a "vast" amount of circumstantial evidence...
Hope that helps to clarify.

By the way, I "did" thoroughly enjoy your post regarding your "medium" experiences!

PUL,
Cosmic_Ambitions