In this hymn, अग्नि , the blackbacked, all-sustaining deity, arises to unify earth and heaven, inspired by flowing rivers [rv-3-7-1 ] rv • Book 3 . अग्नि 's divine steeds transport him, reflecting his universal benefaction [rv-3-7-2 ] rv • Book 3 . As the son of त्वष्टा , he invigorates the world [rv-3-7-4 ] rv • Book 3 , while men celebrate his power, brightening the heavens [rv-3-7-5 ] rv • Book 3 . Attended by sages, अग्नि ensures prosperity through rituals, bestowing blessings, offspring, and favor to devotees [rv-3-7-11 ] rv • Book 3 .