There seems to be an ongoing discussion on the nature of the ego in mysticism and mystical transcendence. On the one hand, some say that the ego-self does not die, but is transformed. On the other hand, some say that ego-self does die, and something else emerges in its place. Which is more accurate? Or could they both have truth?
I wonder if we might find some insightful parallels and further understanding in the 23 distinct personalities who inhabit the mind of the one main character of the recent 2016 American psychological thriller film Split, starring James McAvoy, and the many personalities manifested through the writings of the Prophet Joseph Smith in the Book of Mormon narrative.
The SciShow Psych channel on YouTube published a video about near-death experiences, below. I've mentioned near-death experiences a couple times before in relationship to mysticism and visionary experience. They are very much related, it seems to me.