One such physical reality in post-Alexandrian Greece was the exchange of foreign forms of piety, and the need to explain the existence of these foreign, yet recognizably spiritual institutions. Surely something natural exists at the source of this seemingly-universal sense of piety.
Epíkouros calls this the divine nature. (Whether or not that corresponds with theoretical super-humans is up to you, but at least this much is true: a natural phenomena is responsible for the evolution of religion). Philódēmos records this as something like visions during dreams.
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