Established in my thinking is that this Brain-body, alive and well, has a symbiotic relationship with Core-being. One is temporal, will last up to 100 years or so, the other is not of this world, so to say that he is eternal is not appropriate. He does not "die" when Brain-body dies. What he does, where he goes, is not known and will not be the subject of speculation. He does not, however, cease to exist with the demise of the former.
There is no escaping the fact that the two co-existed for a long time, and shared experiences. Some are new and some are places and people revisited from the past. Both pursue goals, aims, that eventually became compatible, and the relationship is mutually constructive.
Brain-body's goals come from his imagination and reasoning, as he attempts to satisfy perceived needs. When, in the course of events, those goals are antithetical with his objective, Core-being removes himself from the field and the well-being of Brain-body is put in jeopardy until things are again put in order. This was the case several times during this lifetime. Now, and for the past approximately 40 years, the two have been compatible. This could be the reason for insights that are experienced and recorded. Core-being has opened the kimono from time to time.
During a lifetime, the thinking that takes place, of all kinds, acts as food for both components, nourishment, and the more of it there is, the better. Like bodily food, the quality, quantity, and content of it is important, and it is entirely possible that Core-being influences the selection of the subject of such thinking. One of these insights may be the following understanding of what happens upon the death of the Brain-body.
At the time of death, all the physical systems of the body stop functioning. This includes the brain as well as all the organs that support life. The brain dies and that means the memories and impressions, the knowledge, and the skills acquired during the lifetime are lost. The Core-being, however continues his quest in pursuit of his aim, whatever that may be.
Those activities that were instigated by Core-being may produce memories that are shared by Core-being. It is these, now colored by the lifetime just finished, that are carried on to the next inhabitation of a Brain-body. Thus, the next "host" may experience deja vu, as has this one from time to time.
At death, however, the Brain-body ceases to function. To say it doesn't exist anymore isn't true, the dead body is there and slowly returns to the molecular compounds that, if allowed, go back into "circualation." When it dies, all of the experiences it had are likewise ended. Only those recorded as images or words, or that can be recalled by the living, remain. The playwright of Carousel, the Musical, put it succinctly. As long as there is one person who remembers, it isn't over. Core-being, however, continues his spiritual existence.