Śrīmad-Bhāgavatam · Text 10.20.4
Who is speaking and story frame
सान्द्रनीलाम्बुदैर्व्योम सविद्युत्स्तनयित्नुभि: ।
अस्पष्टज्योतिराच्छन्नं ब्रह्मेव सगुणं बभौ ॥ ४ ॥
sāndra-nīlāmbudair vyoma
sa-vidyut-stanayitnubhiḥ
aspaṣṭa-jyotir ācchannaṁ
brahmeva sa-guṇaṁ babhau
The sky was then covered by dense blue clouds accompanied by lightning and thunder. Thus the sky and its natural illumination were covered in the same way that the spirit soul is covered by the three modes of material nature.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.