I'm giving this an upvote. There isn't enough philosophy thrown around here. My thoughts: I recently read a chapter in Michael Sandel's, "Justice" where-in he gives an account of the categorical imperative described by Kant; by the end of the chapter I was having a kind of, "secular mystical experience" where I realized, "the value of everyone around me" wasn't in their biological, social, or physical self-- all these, "human objects" possessed a kind a quality that, "simple objects" don't have-- αὐτονομία or autonomy. We as, "autonomous objects" can, "decide" to do something, "other than what our socially, physically, and biological contingent self" has commanded in the, "tangible" part of our expressive selves. This makes us, "subjects" and not, "objects" a categorization sense. For me a, "demonstrable immortality" would be that if our subjective self is, "separate" from our, "tangible" self even in some, "abstract" way it stands to reason that that part of us might not be even, "living in the universe" and might not be, "subject" (pun intended?) to the causality of the the universe that we seem to be interacting with through our bodies. The Bhagavad Gita, Bhagavat Purana, and many Christian treatise' describe the realization of soul as, "eternal, separated from activity, a silent witness..."

Food for thought! Food for souls? Perhaps! Thanks for some lovely engagement paulpauper. Namaskara and Hare Krsna pal.