Now, this Śrīmad-Bhāgavatam which is full of the narration and topics of the Lord and His devotees... So devotees means one who talks about God, and God means His pastime with His devotee. Anyway, Śrīmad-Bhāgavatam means the topics of the Lord, God. So Kṛṣṇa is within you. According to Śrīmad-Bhāgavatam, śṛṇvatām sva-kathāḥ kṛṣṇa. Those who are hearing about God, or Kṛṣṇa, and what sort of those topics? Now, puṇya-śravaṇa-kīrtanaḥ... One who is narrating and one who is hearing, both of them are being purified. Puṇya. Puṇya means pious, piety. Who, at least those who are hearing this Śrīmad-Bhāgavatam, it is so nice that he is being purified. It is not that all of you are my students, or we are not We don't claim that we have become fully purified, but we have accepted the purificatory process, Kṛṣṇa consciousness. So anyone who hears this chanting of Hare Kṛṣṇa and kindly attends this class, he is also purified. Śṛnvatām sva-kathāḥ kṛṣṇaḥ puṇya-śravaṇa-tanaḥ [SB 1.2.17]. Kīrtana. This chanting is so nice that it makes people, one who is hearing, purified. So a person who is always thinking of Kṛṣṇa, always talking of Kṛṣṇa, then just imagine how much purified he is becoming. So puṇya-śravaṇa-kīrtanaḥ, hṛdy antaḥ stho hy abhadrāṇi vidhunoti suhṛt satyam.
The Lord is friend of the devotee, and as soon as He sees—He is within you—that you are engaged in hearing about Him, He helps you. How He helps you? He cleanses your heart. Therefore a person, although he is born of low family, because he is thinking of Kṛṣṇa, or God, always, oh, he is being purified. Prahlāda Mahārāja gives us evidence that manye tad-arpita-manaḥ. Because he has placed his life, he has placed his endeavor, everything for Kṛṣṇa, by mind, by his body, by activities, therefore prāṇaṁ punāti sa kulaṁ: he is purifying not only himself but his whole family. This is a prerogative. If a boy becomes a devotee, the whole family becomes purified. Sva-kulaṁ. The whole family becomes purified. What best service he can give otherwise than by becoming the devotee of Lord? That is the best service to his father, mother, forefathers, grandfather, everyone. That we will find in this Prahlāda Mahārāja said, sva-kulaṁ. And na tu bhūrimānaḥ.
Prabhupada's lecture - Śrīmad-Bhāgavatam 7.9.10 Montreal, July 9, 1968