One of the proofs of the soul's immortality is that many believed it - they also believed the world was flat"

But this does not substantiate a definite theorum simply because mankind is "ignorant." It only proves that, THAT which mankind has yet to COMPREHEND just as it learned to comprehend the world was not FLAT, it has YET to find the proof (s) to IMMORTALITY of which "medically" some are "exploring." TRUTH does not lay in IGNORANCE, it lays in what is REALITY and many "realities" escape the intellect of mankind for NONE of us know EVERYTHING........