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Śrīmad Bhāgavatam
[Canto 2, Ch. 9]
evaṁ prasanna-manaso bhagavat-bhakti-yogataḥ bhagavat-tattva-vijñānaṁ mukta-saṅgasya jayate.  (Bhāg. 1.2.20)
Thus in the completely satisfied stage of life, exhibited by full detachment from the world of sense enjoyment as the result of performing devotional service, one can understand the science of God in the liberated stage.
In this stage of full satisfaction and detachment from the sensory world, one can know the mystery of the science of God with all its confidential intricacies, and not by grammar or academic speculation. And because Brahmā qualified himself for such reception, the Lord was pleased to disclose the purpose of  Śrīmad-Bhāgavatam . This direct instruction by the Lord to any devotee who is detached from the world of sense gratification is possible, as is stated in the  Bhagavad-gītā :
teṣāṁ satata-yuktānāṁ bhajatāṁ prīti-pūrvakam dadāmi buddhi-yogaṁ taṁ yena mām upayanti te.  (Bg. 10.10)
Unto the devotees who are constantly engaged in the transcendental loving service ( prīti-pūrvakam ) of the Lord, the Lord out of His causeless mercy upon the devotee gives direct instructions so that the devotee may make accurate progress on the path of returning home, back to Godhead. One should not, therefore, try to understand these four verses of  Śrīmad-Bhāgavatam  by mental speculation. Rather, by direct perception of the Supreme Personality of Godhead, one is able to know all about His abode, Vaikuṇṭha, as was seen and experienced by Brahmājī. Such Vaikuṇṭha realization is possible by any devotee of the Lord situated in the transcendental position as a result of devotional service.
In the  Gopāla-tāpanī Upaniṣad  ( Śruti ) it is said that the Lord appeared before Brahmājī as “ gopa-veśome purastād āvirbhūvaḥ ”: the Lord appeared before Brahmā as a cowboy, that is, as the original Personality of Godhead, Lord Śrī Kṛṣṇa, Govinda, who is later described by Brahmājī in his  Brahma-saṁhitā :
cintāmaṇi-prakara-sadmasu kalpavṛkṣa- lakṣāvṛteṣu surabhīr abhipālayantam lakṣmī-sahasra-śata-sambhrama-sevyamānaṁ govindam ādi-puruṣaṁ tam ahaṁ bhajāmi.  (Bs. 5.29)
Brahmājī desires to worship the original Personality of Godhead, Lord Śrī Kṛṣṇa, who resides in the topmost Vaikuṇṭha planet, known as Goloka