Here Arjuna expresses himself through the grace of Kṛṣṇa. If we want to understand Bhagavad-gītā, we should accept the statements in these two verses. This is called the paramparā system, acceptance of the disciplic succession. Unless one is in the disciplic succession, he cannot understand Bhagavad-gītā. It is not possible by so-called academic education. Unfortunately those proud of their academic education, despite so much evidence in Vedic literatures, stick to their obstinate conviction that Kṛṣṇa is an ordinary person.
(Bhagavad-Gita---10:12-13----purport).

Arjuna herein confirms that persons of faithless and demonic nature cannot understand Kṛṣṇa. He is not known even by the demigods, so what to speak of the so-called scholars of this modern world? By the grace of the Supreme Lord, Arjuna has understood that the Supreme Truth is Kṛṣṇa and that He is the perfect one. One should therefore follow the path of Arjuna. He received the authority of Bhagavad-gītā. As described in the Fourth Chapter, theparamparā system of disciplic succession for the understanding of Bhagavad-gītā was lost, and therefore Kṛṣṇa reestablished that disciplic succession with Arjuna because He considered Arjuna His intimate friend and a great devotee. Therefore, as stated in our Introduction to Gītopaniṣad, Bhagavad-gītā should be understood in the paramparā system. When the paramparā system was lost, Arjuna was selected to rejuvenate it. The acceptance by Arjuna of all that Kṛṣṇa says should be emulated; then we can understand the essence of Bhagavad-gītā, and then only can we understand that Kṛṣṇa is the Supreme Personality of Godhead.
(Bhagavad-Gita---10:14----purport).

The fact is that the devotee is not concerned with seeing the viśva-rūpa, the universal form, but Arjuna wanted to see it to substantiate Kṛṣṇa's statements so that in the future people could understand that Kṛṣṇa not only theoretically or philosophically presented Himself as the Supreme but actually presented Himself as such to Arjuna. Arjuna must confirm this because Arjuna is the beginning of the paramparā system. Those who are actually interested in understanding the Supreme Personality of Godhead, Kṛṣṇa, and who follow in the footsteps of Arjuna should understand that Kṛṣṇa not only theoretically presented Himself as the Supreme, but actually revealed Himself as the Supreme.
(Bhagavad-Gita---11:8----purport).

All transcendental messages are received properly in the chain of disciplic succession. This disciplic succession is called paramparā. Unless therefore Bhāgavatam or any other Vedic literatures are received through the paramparā system, the reception of knowledge is not bona fide. Vyāsadeva delivered the message to Śukadeva Gosvāmī, and from Śukadeva Gosvāmī, Sūta Gosvāmī received the message. One should therefore receive the message of Bhāgavatam from Sūta Gosvāmī or from his representative and not from any irrelevant interpreter.
(Srimad Bhagavatam----1:3:42----purport).

Communion with the Lord by transmission of the transcendental sound is nondifferent from the whole spirit Lord Śrī Kṛṣṇa. It is a completely perfect method for approaching the Lord. By such pure contact with the Lord, without offense of material conceptions (numbering ten), the devotee can rise above the material plane to understand the inner meaning of the Vedic literatures, including the Lord's existence in the transcendental realm. The Lord reveals His identity gradually to one who has unflinching faith, both in the spiritual master and in the Lord. After this, the devotee is endowed with mystic opulences, which are eight in number. And above all, the devotee is accepted in the confidential entourage of the Lord and is entrusted with specific service of the Lord through the agency of the spiritual master. A pure devotee is more interested in serving the Lord than in showing an exhibition of the mystic powers dormant in him. Śrī Nārada has explained all these from his personal experience, and one can obtain all the facilities which Śrī Nārada obtained by perfecting the chanting process of the sound representation of the Lord. There is no bar for chanting this transcendental sound by anyone, provided it is received through Nārada's representative, coming down by the chain of disciplic succession, or the paramparā system.
(Srimad Bhagavatam----1:5:39----purport).

The Vedic truths are all perfect descriptions of the factual truth without any mistake or illusion, and Śukadeva Gosvāmī wants to present the truths of creation not as a metaphysical theory of philosophical speculation, but as the actual facts and figures of the subject, since he would be dictated to by the Lord exactly in the same manner as Brahmājī was inspired. As stated in the Bhagavad-gītā (15.15), the Lord is Himself the father of the Vedānta knowledge, and it is He only who knows the factual purport of the Vedānta philosophy. So there is no greater truth than the principles of religion mentioned in the Vedas. Such Vedic knowledge or religion is disseminated by authorities like Śukadeva Gosvāmī because he is a humble devotional servitor of the Lord who has no desire to become a self-appointed interpreter without authority. That is the way of explaining the Vedic knowledge, technically known as the paramparā system, or descending process.
(Srimad Bhagavatam----2:4:23----purport).

The perfection of the paramparā system, or the path of disciplic succession, is further confirmed. In the previous chapter it has been established that Brahmājī, the firstborn living entity, received knowledge directly from the Supreme Lord, and the same knowledge was imparted to Nārada, the next disciple. Nārada asked to receive the knowledge, and Brahmājī imparted it upon being asked. Therefore, asking for transcendental knowledge from the right person and receiving it properly is the regulation of the disciplic succession. This process is recommended in the Bhagavad-gītā (4.2). The inquisitive student must approach a qualified spiritual master to receive transcendental knowledge by surrender, submissive inquiries and service. Knowledge received by submissive inquiries and service is more effective than knowledge received in exchange for money. A spiritual master in the line of disciplic succession from Brahmā and Nārada has no demand for dollars and cents. A bona fide student has to satisfy him by sincere service to obtain knowledge of the relation and nature of the individual soul and the Supersoul.
(Srimad Bhagavatam----2:5:1----purport).

Vedic transcendental knowledge descends directly from the Personality of Godhead. By His mercy, Brahmā, the first living being in the universe, was enlightened, and from Brahmājī, Nārada was enlightened, and from Nārada, Vyāsa was enlightened. Śukadeva Gosvāmī received such transcendental knowledge directly from his father, Vyāsadeva. Thus the knowledge, being received from the chain of disciplic succession, is perfect. One cannot be a spiritual master in perfection unless and until one has received the same by disciplic succession. That is the secret of receiving transcendental knowledge. The six great sages mentioned above may be great thinkers, but their knowledge by mental speculation is not perfect. However perfect an empiric philosopher may be in presenting a philosophical thesis, such knowledge is never perfect because it is produced by an imperfect mind. Such great sages also have their disciplic successions, but they are not authorized because such knowledge does not come directly from the independent Supreme Personality of Godhead, Nārāyaṇa. No one can be independent except Nārāyaṇa; therefore no one's knowledge can be perfect, for everyone's knowledge is dependent on the flickering mind. Mind is material and thus knowledge presented by material speculators is never transcendental and can never become perfect. Mundane philosophers, being imperfect in themselves, disagree with other philosophers because a mundane philosopher is not a philosopher at all unless he presents his own theory. Intelligent persons like Mahārāja Parīkṣit do not recognize such mental speculators, however great they may be, but hear from the authorities like Śukadeva Gosvāmī, who is nondifferent from the Supreme Personality of Godhead by the paramparā system, as is specially stressed in the Bhagavad-gītā.
(Srimad Bhagavatam----2:8:25----purport).

Śrīmad-Bhāgavatam is the text of the Personality of Godhead and His unalloyed devotees, who are also known as the bhāgavatas, and any outsider should have no access to this confidential literature of devotional service. But unfortunately the impersonalist, who has no relation to the Supreme Personality of Godhead, sometimes tries to interpret Śrīmad-Bhāgavatam by his poor fund of knowledge in grammar and dry speculation. Therefore, the Lord warns Brahmā (and, through Brahmā, all future devotees of the Lord in the disciplic succession of Brahmā) that one should never be misled by the conclusion of the so-called grammarians or by other men with a poor fund of knowledge, but must always fix the mind properly, via the paramparā system. No one should try to give a new interpretation by dint of mundane knowledge. And the first step, therefore, in pursuance of the system of knowledge received by Brahmā, is to approach a bona fide guru who is the representative of the Lord following the paramparā system. No one should try to squeeze out his own meaning by imperfect mundane knowledge. The guru, or the bona fide spiritual master, is competent to teach the disciple in the right path with reference to the context of all authentic Vedic literature. He does not attempt to juggle words to bewilder the student. The bona fide spiritual master, by his personal activities, teaches the disciple the principles of devotional service. Without personal service, one would go on speculating like the impersonalists and dry speculators life after life and would be unable to reach the final conclusion. By following the instructions of the bona fide spiritual master in conjunction with the principles of revealed scriptures, the student will rise to the plane of complete knowledge, which will be exhibited by development of detachment from the world of sense gratification.
(Srimad Bhagavatam----2:9:37----purport).