kaśmalaṁ śamayann iva

atha-thereupon; abhipretam-intention; anviksya-observing; brahmanah-of Brahma; madhusudanah-the killer of the Madhu demon; visanna-depressed; cetasam-of the heart; tena-by him; kalpa-millennium; vyatikara-ambhasa-devastating water; loka-samsthana-situation of the planetary system; vijnane-science; atmanah-of himself; parikhidyatah-sufficiently anxious; tam-unto him; aha-said; agadhaya-deeply thoughtful; vaca-by words; kasmalam-impurities; samayan-removing; iva-like that.