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Perhaps in that era, some people found one of the ways to continue.
Concentrating and refining the spirit, believing that flesh is weak, and the spirit will be eternal, is likely also a branch of that era.
But this history is really too distant, even older than any human records.
It can no longer be examined or traced.
Lu Ren wasn't overly curious or concerned about these matters, but the Red Jade Scroll left behind a Taoist Scripture.
Its name is "Supreme Guardian Spirit Heart Sutra".
It bears a similar name to the "Supreme Inspiration Residence" he obtained from Chen Guanzhen in the Underworld, but the content is vastly different.
This Supreme Guardian Spirit Heart Sutra discusses the spiritual aspect of cultivation.