You cannot ask about spiritual knowledge from a person by challenging. No. That will not help you. Just like Kṛṣṇa .When he was talking with Arjuna like friend, the problem was not solved. Then Arjuna surrendered unto Kṛṣṇa: śiṣyas te 'haṁ śādhi māṁ prapannam (BG 2.7). He understood that "Simply by friendly talkings and argument, there cannot be any conclusion of spiritual life." One must surrender. He knew it. Gurum eva abhigacchet. Must. Abhigacchet is vidhiliṅ form of verb. Means "He must." There is no other alternative.
So therefore Arjuna submitted. And he was enlightened. So simply by hearing from the authoritative sources, nityaṁ bhāgavata-sevayā, as it is described. But we don't find anywhere saptāhaṁ bhāgavata-sevayā. No. Nityaṁ bhāgavata-sevayā.
So nityaṁ bhāgavata-sevayā (SB 1.2.18). Naṣṭa-prāyeṣu abhadreṣu. Abhadra. Abhadra means the quality of ignorance and passion. They are abominable. Ignorance is most abominable, abominable, and passion is abominable. These two things must be given up. But simply by hearing about Kṛṣṇa, simply by hearing Śrīmad-Bhāgavatam from the person bhāgavatam, one can get rid of these dirty things, namely mode of ignorance and mode of passion. Then the balance is the mode of goodness.
There are three guṇa, modes: ignorance, passion and goodness. So if we can, somehow or other, can avoid the low-grade modes, namely ignorance and passion, then naturally we come to the platform of goodness. That is also not sufficient. Therefore it is said here, naṣṭa-prāyeṣu, almost finished all dirty things. "No, I am now situated in goodness, in brahminical qualifications." So the śāstra says it is all right. But still it is dirty.