Bhagavatapurana 1.10.23

1.10.23

sa vā ayaṃ yat padam atra sūrayo jitendriyā nirjitamātariśvanaḥ /
paśyanti bhaktyutkalitāmalātmanā nanveṣa sattvaṃ parimārṣṭum arhati //

23. My friend, this Kṛishṇa is, indeed, that Supreme Lord whom (or whose feet) wise men see, when they have controlled their senses and breaths, by the mind purified with intense devotion; He alone can purify our understanding; [may He be pleased not to erase His knowledge (memory) from our mind when He goes out of our sight].