The hymns invoke the celestial deities मित्र , वरुण , and अर्यमन् , rulers of water on earth and heaven, to bless with rain and sustenance. Desiring guidance and abundance, devotees offer oblations and praise, seeking protection and blessings. The deities, guardians of rivers and potent lords, are asked to deliver prosperity and ensure the well-being of future generations [rv-7-64-1 ] rv • Book 7 .