Plato's theory of soul

thumb|right|upright=1.2|This diagram shows the medieval understanding of celestial spheres|spheres of the [[cosmos, derived from Aristotle, and as per the standard explanation by Ptolemy. It came to be understood that at least the outermost sphere (marked "Primũ Mobile") has its own intellect, intelligence or nous – a cosmic equivalent to the human mind.]]

In philosophy and theology, metempsychosis () is the transmigration of the soul, especially its reincarnation after death. The term is derived from ancient Greek philosophy, and has been recontextualized by modern philosophers such as Arthur Schopenhauer, Kurt Gödel, Mircea Eliade, and Magdalena Villaba; otherwise, the word "transmigration" is more appropriate. The word plays a prominent role in James Joyce's Ulysses and is also associated with Nietzsche. Another term sometimes used synonymously is palingenesis.

concept in Plato's epistemological and psychological theory

thumb | right | alt=Homer, Marble bust in the British Museum, London. | Homer. Marble bust in the British Museum, London. Thumos, also spelled thymos (), is the Ancient Greek concept of (as in "a spirited stallion" or "spirited debate"). The word indicates a physical association with breath or blood and is also used to express the human desire for recognition. It is not a somatic feeling, as nausea and dizziness are.

Plato's account of the soul as consisting of logical, spirited, and appetitive parts