The knowledge was received by . . ., through . . ., knowledge was imparted or instructed by Nārāyaṇa, or Kṛṣṇa. Brahmā received it, and from Brahmā, Nārada received it. From Nārada, Vyāsadeva received it, and Vyāsadeva is writing this Śrīmad-Bhāgavatam. Lokasyājānato vidvāṁś cakre sātvata-saṁhitām (SB 1.7.6). Anarthopaśamaṁ sākṣād bhakti-yogam adhokṣaje (SB 1.7.6). Great learned sages, saintly persons, they're always thinking how the people will be happy. Vaisvana, para duḥkha-duḥkhi: he is always unhappy for unhappiness of the people in general, public. That is Vaiṣṇava. Para duḥkha-duḥkhi. Just like in the Western country Lord Jesus Christ, he was unhappy for others. So that is the business of devotee, God's son or God's devotee. That is the duty, that people are suffering on account of proper knowledge, and the most grievous ignorance is without any knowledge of God. That is the most dangerous ignorance. Because human life is meant for understanding God. Athāto brahma jijñāsā. But they do not care to understand God. Then animal life: "Where is food, where is sex, where is apartment, and where is defense force?" this is going on.
Therefore the challenge was that "Now explain what is dharma." So they're explaining. Mind that. They are not educated themselves, but their education is by hearing from the authority. Iti śuśruma. This is real education. Therefore Vedas' another name is śruti. Śruti means the knowledge which you receive by hearing, not by your so-called eyes or tongue. No. The tongue, you can chant what you hear. Therefore our beginning of knowledge is śravaṇaṁ kīrtanaṁ.