It is said, satāṁ prasaṅgān mama vīrya-saṁvido bhavanti hṛt-karṇa-rasāyanāḥ kathāḥ (SB 3.25.25). If the Bhāgavata discussion is done between the two potents, the disciple and the master, then immediately, sadyaḥ hṛdi avarudhyate, as it is said in the beginning.
(aside) Have you got Bhāgavata? The first, beginning?
Sadyo hṛdy avarudhyate. Nigama-kalpa-taror galitaṁ phalam idam (SB 1.1.3), śrīmad-bhāgavatam. Sadyo hṛdy avarudhyate, śuśrūṣubhis tat-kṣaṇāt. Śuśrūṣubhiḥ, those who are serious about understanding about the Supreme Absolute Truth, so for him, immediately God becomes entrapped within the heart. God is there, but especially . . . hṛdi avarudhyate, kiṁ vā paraiḥ īś . . . avarudhyate means you capture God. If there is discussion between devotees . . . tuṣyanti ca ramanti ca, in Bhagavad-gītā it is said. Tuṣyanti ca ramanti ca. When Bhāgavata discussion is there amongst devotees . . .
It is the business of the devotees, not the business of the nondevotee.