Brahmā’s Day, the Four Pralayas, and the Supreme Shelter Beyond Cause–Effect
सामुद्रं दैहिकं भौमं रसं सांवर्तको रवि: । रश्मिभि: पिबते घोरै: सर्वं नैव विमुञ्चति ॥ ८ ॥
sāmudraṁ daihikaṁ bhaumaṁ rasaṁ sāṁvartako raviḥ raśmibhiḥ pibate ghoraiḥ sarvaṁ naiva vimuñcati
The sun in its annihilating form will drink up with its terrible rays all the water of the ocean, of living bodies and of the earth itself. But the devastating sun will not give any rain in return.
This verse says that during dissolution the Sāṁvartaka sun, with fierce rays, drinks up all moisture from oceans, bodies, and the earth, leaving nothing behind.
He is explaining the stages of pralaya to Mahārāja Parīkṣit, showing how the cosmos is withdrawn by divine arrangement and why the material world is ultimately temporary.
It encourages vairāgya (detachment): since even the oceans and bodily vitality are taken away in time, one should invest life in bhakti and remembrance of the Supreme rather than clinging to impermanent possessions.