Plato's tripartite theory of soul is a theory of psyche proposed by the ancient Greek philosopher Plato in his treatise the Republic. In Republic, Plato asserted that the ψυχή (psyche) is composed of three parts; the λογιστικόν (logistikon, logical), the θυμοειδές (thymoeides, spirited) and the ἐπιθυμητικόν (epithymetikon, appetitive). These three parts of the ψυχή also correspond to the three classes of a society. Whether in a city or an individual, δικαιοσύνη (dikaiosyne, justice) is declared to be the state of the whole in which each part fulfills its function without attempting to interfere in the functions of others. The function of the ἐπιθυμητικόν is to produce and seek pleasure, often being linked to the love of money. The function of the λογιστικός is to gently rule through the lo