Pradyumna: "In this prayer, Śrīla Sūta Gosvāmī practically summarizes the complete introduction of Śrīmad-Bhāgavatam. Śrīmad-Bhāgavatam is the natural supplementary commentary on the Vedānta-sūtras. The Vedānta-sūtras or the Brahma-sūtras were compiled by Vyāsadeva with a view to presenting just the cream of Vedic knowledge."
Prabhupāda: Yes. First of all, there was only one Veda, Atharva-veda. Then he divided according to the subject matter into four Vedas: Sāma, Yajur, Atharva, Ṛg. Then he explained the Vedas by the Purāṇas, and he compiled Mahābhārata also for same purpose, how one can understand the Vedic literature. Strī-śūdra-dvija-bandhūnāṁ trayī na śruti-gocarā (SB 1.4.25). Those who are less intelligent, woman, śūdra, and dvija-bandhu... Dvija-bandhu means those who are born in brāhmaṇa family but are not just to the quality. They are called dvija-bandhu. For them this Mahābhārata. And at the end he compiled, he summarized the whole thing by writing Vedānta-sūtra. Still, he was not happy, and under the direction of his spiritual master Nārada he wrote himself the commentary of the Vedānta-sūtra, and that is Śrīmad-Bhāgavatam. Go on.
Pradyumna: "Śrīmad-Bhāgavatam is the natural commentary on this cream. Śrīla Śukadeva Gosvāmī was a thoroughly realized master of the Vedānta-sūtra, and consequently he also personally realized the commentary, Śrīmad-Bhāgavatam. And just to show his boundless mercy upon bewildered materialistic men who want to cross completely over nescience, he recited for the first time this confidential knowledge. There is no point in arguing that a materialistic man can be happy. No materialistic creature, be he the great Brahmā or an insignificant ant, can be happy. Everyone tries to make a permanent plan for happiness, but everyone is baffled by the laws of material nature. Therefore the materialistic world is called the darkest region of God's creation. Yet the unhappy materialists can get out of it simply by desiring to get out. Unfortunately they are so foolish that they do not want to escape."