Śrīmad-Bhāgavatam · Text 4.31.17
Who is speaking and story frame
यथा नभस्यभ्रतम:प्रकाशा
भवन्ति भूपा न भवन्त्यनुक्रमात् ।
एवं परे ब्रह्मणि शक्तयस्त्वमू
रजस्तम:सत्त्वमिति प्रवाह: ॥ १७ ॥
yathā nabhasy abhra-tamaḥ-prakāśā
bhavanti bhūpā na bhavanty anukramāt
evaṁ pare brahmaṇi śaktayas tv amū
rajas tamaḥ sattvam iti pravāhaḥ
My dear Kings, sometimes in the sky there are clouds, sometimes there is darkness, and sometimes there is illumination. The appearance of all these takes place consecutively. Similarly, in the Supreme Absolute, the modes of passion, darkness and goodness appear as consecutive energies. Sometimes they appear, and sometimes they disappear.
Read Śrīla Prabhupāda's purport on Vedabase.io