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Rebirth and realms of existence

Rebirth and realms of existence are fundamental teachings of Mahavira. According to the Acaranga Sutra, Mahavira believed that life existed in myriad forms which included animals, plants, insects, bodies of water, fire, and wind. He taught that a monk should avoid touching or disturbing any of them (including plants) and never swim, light (or extinguish) a fire, or wave their arms in the air; such actions might injure other beings living in those states of matter.

Mahavira preached that the nature of existence is cyclic, and the soul is reborn after death in one of the trilok – the heavenly, hellish, or earthly realms of existence and suffering. Humans are reborn, depending on one's karma (actions) as a human, animal, element, microbe, or other form, on earth or in a heavenly (or hellish) realm. Nothing is permanent; everyone (including gods, demons and earthly beings) dies and is reborn, based on their actions in their previous life. Jinas who have reached Kevala Jnana (omniscience) are not reborn; they enter the siddhaloka, the "realm of the perfected ones".