Religious deities, most of which are considered to be immortal.
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This theory of quantum immortality, however, is not widely regarded by the scientific community as being a verifiable or even necessarily correct offshoot of the many worlds interpretation, which itself exists as one possible interpretation of quantum mechanics among many.
Sometimes immortality is used as a punishment, or a curse that might be intended to teach a lesson.
Beings born with immortality (such as deities, demigods and races with "limited immortality") are usually quite adjusted to their long lives, though some may feel sorrow at the passing of mortal friends, but they still continue on.
The major religious interest in Taoist followers can be said to be the quest for longevity or immortality (ch'ang sheng pu ssu) which always meant physical immortality as the soul or personality was regarded as being an incorporation of several interrelated souls that were dispersed at death.
It was believed that immortality was achieved by nourishing the "vital principle" and implied that humans might change their body into some substance which was lighter and more lasting.
Clear evidence of an immortality cult is found in the reign of Ch'in Shih Huang Ti (r.221-210 BCE), who sought out immortals and provided financial support to magicians who were seeking the drug of immortality.