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We, as humans, don't know how to be satisfied. We hunger for more. We live a life where there is no contentment. We develop more and more but in the end we did not have a complete life

To be human is to have this existential emptiness. What benefit does completeness provide to a biological organism? States of mindfulness arise through meditation, prayer, yoga, chanting, dancing etc, but they serve as virtual tools to momentarily grasp at completeness.

You put it nicely @xanadumedia.
Man's appetite is insatiable leaving him seeking and searching always longing to expand without bounds