CC Madhya 20.270
sattvaṁ ca miśraṁ na ca kāla-vikramaḥ
na yatra māyā kim utāpare harer
anuvratā yatra surāsurārcitāḥ
This verse from Śrīmad-Bhāgavatam (2.9.10) was spoken by Śrīla Śukadeva Gosvāmī. He was answering the questions of Parīkṣit Mahārāja, who asked how the living entity falls down into the material world. Śukadeva Gosvāmī explained the cream of Śrīmad-Bhāgavatam in four verses, which had been explained to Lord Brahmā at the end of the severe austerities he performed for one thousand celestial years. At that time, Brahmā was shown the spiritual world and its transcendental nature.