There are six realms of transmigration where beings take birth.
They are the realms of gods, demigods, humans, animals, hungry ghosts, and hell.
You take birth in those realms because of superior, middling, and evil karmas.

Buddha Shakyamuni

Lankavatara Sutra

source: http://www.lionsroar.com/the-power-of-positive-karma/


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