It is said that human being do not need any formal ranks, titles, and law to keep orders when their group is 150. But when this number exceeds it is difficult to maintain and make things works.
Yoval Noah Harari named this number as critical threshold in his book “Sapiens: a brief history of human kind.” So for large number of people to work together in a group, people gave initiation of fictional things. That is where common myths, beliefs or purpose comes from.
He says everything is fictional. Only the physical things that we can feel and touch with brain and body is non-fiction.
Everything else is imagination…