In due course, Xšaθra's association with a stony firmament was eclipsed by the association with a metallic sky, and thence to metals in general. In non-specific usage In non-specific usage, the term Amesha Spenta denotes all the divinities that furthered or strengthened creation and all that are bounteous and holy. It not only includes the Ahuras (a term that in the Gathas is also used in the plural but only includes Ahura Mazda by name), but also all the other divinities that are alluded to in these texts. In this non-specific sense of the term, Amesha Spenta is then equivalent to the term yazata. Non-specific usage is significantly less common than the use of the term to specifically denote the great divine entities (see above). The non-specific usage is particularly evident in the 9th-14th century texts of Zoroastrian tradition, but there are also instances in the Avesta proper where it is used this way. In Yasna 1.2 for instance, the yazata Atar is declared to be "the most active of the Amesha Spentas." Even in present-day Zoroastrianism, the term is frequently used to refer to the thirty-three divinities that have either a day-name dedication in the Zoroastrian calendar or that have a Yasht dedicated to them (or both). This general, non-specific, meaning of the term Amesha Spenta also has an equivalent in the Vedic Sanskrit Vishve Amrtas, which is the collective term for all supernatural beings (lit: 'all immortals'). Doctrine The doctrine of the Amesha Spenta, through their connection with creation, unites ethereal and spiritual concepts with material and manifest objects in a "uniquely Zoroastrian" way: not only as abstract "aspects" of Ahura Mazda but also worthy of reverence themselves and personified or represented in all material things. The relationship between Ahura Mazda and the Amesha Spenta is an altogether subtle one. In Yasna 31.11 of the Gathas, Ahura Mazda is said to have created the universe with his "thought". In other passages, such as Yasna 45.4, he is described as the metaphorical "father" of the individual Amesha Spenta, which, even though it is figurative, suggests a familial closeness. In particular, the relationship between Ahura Mazda and Spenta Mainyu is multifaceted and complex and "as hard to define as that of Yahweh and the Holy Spirit in Judaism and Christianity." A veneration for the Amesha Spenta through the living world is still present in modern Zoroastrian tradition and is evident