Bhagavatapurana 1.1.11

1.1.11

bhūrīṇi bhūrikarmāṇi śrotavyāni vibhāgaśaḥ /
ataḥ sādho 'tra yat sāraṃ samuddhṛtya manīṣayā /
brūhi bhadrāya bhūtānāṃ yenātmā suprasīdati //

11. Many are the sastras dealing with many-fold duties that are to be studied in detail and systematically, too; O good Suta, do you, by force of your intelligence, extract whatever is essential and for the good of all beings, tell us who are full of faith, of that essence by which the mind becomes clear and serene.