There are some things that cannot be proven to another person, but have to be experienced to be understood. You can't explain "green" to someone who has never seen anything of that color. The person has to be shown something green so he can experience it for himslef. The real problem with that is what I've seen happen on numerous occaisions to careful and objective researchers in the fields of spirituality, parapsychology, or any other subject frowned upon by "conventional" science. For example, suppose that meditators make the claim that it is possible to experience pure consciousness, or consciousness without content. Main-stream psychology says this is not possible, but any experienced meditator knows that it is possible. But if a respected main-stream psychologist takes the time and effort to learn the proper meditation techniques, and then experiences pure consciousness for himself, his colleagues immediately respond with something to the effect that "Old Joe has gone mystical on us. Clearly we can't believe a word he says any more. He's lost his grip on reality." or, if "old Joe" is getting up there in years they will likely blame is obvious senility, or the fact that as he gets older he has become frightened by the approach his own mortality as is turning to squishy fantasies to calm his fears. Like that defining moment in "Dances With Wolves" when the soldier looks at Kevin Costner and says "You turned Injun, didn't you?", once our distinguished professor of psychology (or physics, or philosophy, or...) experiences what convention says he cannot experience, the establishment is through with him. He is branded an outcast and a traitor. And as long as that mind set persists then mainstream science will never even admit to the existence of common phenomena that anyone can experience if he or she invests a little time in pursuing those personal experiences. It's really sad to see mainstream academia being left further and further behind as the spiritual frontiers are explored by the "traitors" and "outcasts". What is even sadder is to see those from the main-stream trying (with the best of intentions, I might add) to convince us "traitors" and "outcasts" just how foolish we are for believing what we have experienced first hand. If only they would take the time to explore the possibilities for themselves. But of course to do so would be to risk becoming an outcast, and in science, consensus is king, conformity is law, and the illusion of certainty is the security blanket they all wrap themselves in.