Bhagavatapurana 5.16.3

5.16.3

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bhagavato guṇamaye sthūla-rūpa āveśitaṃ mano hy aguṇe 'pi sūkṣmatama ātma-jyotiṣi pare brahmaṇi bhagavati vāsudevākhye kṣamam āveśituṃ tad u haitad guro 'rhasy anuvarṇayitum iti //

3. For, the mind first centred on the Lord's gross form

associated with the three gunas becomes gradually fit also to be devoted to the subtle light of Atman not approached by gunas (without the association of gunas)— the glorious Atman who is the supreme Brahman known also as the glorious Vasudeva; therefore, O preceptor, mayest thou be pleased to describe to me (the same in detail)!