Before I conclude this “cosmological” problem, I want to express my belief that the historical aspect will present challenges for several reasons. Generally, we do not have access to many ancient manuscripts. The primary issue is that institutions like the Catholic Church hold the materials necessary to understand the history of the Western world specifically.

Personality leaks out but is not a constant. Most everyone I've ever known is in bondage to shame and emotional pain. And we never get to know the authentic self, the personality, because of it. And therefore, a relationship is rarely established with the person. This happens to most people we know. They go to the grave having no idea who they are. How sad!