Mana is the animating principle of Polynesian spirituality — a force of power, authority, prestige and effectiveness that inheres in persons, objects, places and words. Mana is not a fixed possession — it is relational and dynamic, increasing through right action, successful endeavour, connection with the sacred and honouring of ancestors, and decreasing through transgression, failure and disconnection. A chief's mana is both a spiritual reality and a social fact — his authority derives from and is maintained by his mana.
Tapu (the origin of the English word "taboo") is the corresponding concept of sacred restriction — the state of being set apart, connected with the divine and therefore restricted from ordinary contact. Persons, objects, places and times can be tapu — the violation of tapu generates consequences both spiritual and social. The system of tapu and noa (the ordinary, unrestricted state) structures the interface between the sacred and the everyday in Polynesian life.