 Reincarnation is the philosophical or religious concept that an aspect of a living being starts a new life in a different physical body or form after each biological death. It is also called rebirth or transmigration, and is a part of the essay Sarodakthran of Cyclic Existence. It is a central tenet of all major Indian religions, namely Jainism, Hinduism, Buddhism, and Sikhism. The idea of reincarnation is found in many ancient cultures, and a belief in rebirth slash netum psychosis was held by Greek historic figures, such as Pythagoras, Socrates, and Plato. It is also a common belief of various ancient and modern religions such as spiritism, Theosophy, and Ekankar, and as an esoteric belief in many streams of Orthodox Judaism. It is found as well in many tribal societies around the world, in places such as Australia, East Asia, Siberia, and South America. Although the majority of denominations within Christianity and Islam do not believe that individuals reincarnate, particular groups within these religions do refer to reincarnation. These groups include the mainstream historical and contemporary followers of Cuthers, Alawites, Vittors, and the Rosa Crucians. The historical relations between these sects and the beliefs about reincarnation that were characteristic of Neoplatonism, Orphism, Hermeticism, Manachianism, and Gnosticism of the Roman era as well as the Indian religions have been the subject of recent scholarly research. Unity Church and its founder Charles Gilmore teaches reincarnation. In recent decades, many Europeans and North Americans have developed an embarrassed in reincarnation, and many contemporary works mention it.