Concentration of the mind upon Kṛṣṇa the Supreme is made possible by prescribed devotional service in nine different forms, of which śravaṇam is the first and most important. The Lord therefore says to Arjuna, “tat śṛṇu,” or “Hear from Me.” No one can be a greater authority than Kṛṣṇa, and therefore by hearing from Him one receives the greatest opportunity for progress in Kṛṣṇa consciousness. One has therefore to learn from Kṛṣṇa directly or from a pure devotee of Kṛṣṇa—and not from a nondevotee upstart, puffed up with academic education.

Bhagavad-gita 7.1 [Purport]

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