Asha (; also arta ; Avestan:"𐬀𐬴𐬀" "aṣ̌a/arta") is a Zoroastrian concept with a complex and highly nuanced range of meaning. It is commonly summarized in accord with its contextual implications of 'truth' and 'right(eousness)', 'order' and 'right working'. For other connotations, see meaning below. It is of cardinal importance to Zoroastrian theology and doctrine. In the moral sphere, "aṣ̌a/arta" represents what has been called "the decisive confessional concept of Zoroastrianism".  .</ref> The opposite of Avestan "aṣ̌a" is "𐬛𐬭𐬎𐬘 druj", "deceit, falsehood".