Embodying the essence of divine invocation, अग्नि , the eternal flame, bridges mortals with deities, granting prosperity through sacrifices [rv-4-2-1 ] rv • Book 4 . Celebrated for his strength and swiftness [rv-4-2-2 ] rv • Book 4 , अग्नि brings wealth and favor from gods like अर्यमन् , वरुण , and विष्णु [rv-4-2-4 ] rv • Book 4 . He rewards the devout and defends against malevolence [rv-4-2-8 ] rv • Book 4 . Through अग्नि 's radiance, worshippers are uplifted and nurtured [rv-4-2-19 ] rv • Book 4 .