The सुक्त praises the divine entities of हेअवेन् and एअर्थ् , described as vast, excellent, benevolent, and the leaders of sacrifice, whose sons are the gods [rv-4-56-1 ] rv • Book 4 . They are invited to bless sacrifices with their presence, attracted by hymns [rv-4-56-2 ] rv • Book 4 . It acknowledges their creation as a good deed, forming immoveable, beautiful worlds, providing protection, sustenance, and prosperity [rv-4-56-3 ] rv • Book 4 .