Reincarnation, literally "to be mae flesh again", is a doctrine or metaphysical belief that some essential part of a living being (in some variations only human beings) survives death to be reborn in a new body. This essential part is often referred to as the spirit or soul, the "higher" or "true" self, "divine spark", or "I". According to such beliefs, a new personality is developed during each life in the physical world, but some part of the self remains constant throughout the successive lives.