We should understand that Śrīmad-Bhāgavatam is the real explanation of the Brahma-sūtra, and it is compiled by Vyāsadeva himself. In the Garuḍa Purāṇa it is said:
- artho 'yaṁ brahma-sūtrāṇāṁ
- bhāratārtha-vinirṇayaḥ
- gāyatrī-bhāṣya-rūpo 'sau
- vedārtha-paribṛṁhitaḥ
- grantho 'ṣṭādaśa-sāhasraḥ
- śrīmad-bhāgavatābhidhaḥ
"The Śrīmad-Bhāgavatam is the authorized explanation of Brahma-sūtra, and it is a further explanation of Mahābhārata. It is the expansion of the gāyatrī mantra and the essence of all Vedic knowledge.