Texts 12-13
The Onulence of the Absolute.
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dent of the Supreme Lord Krṣṇa. That ignorance is removed perfectly by the discharge of devotional service. This is already explained in the previous verse by the Lord. Now by His grace, Arjuna is accepting Him as the Supreme Truth, in concordance with the Vedic injunction. It is not because Krṣṇa is an intimate friend of Arjuna that he is flattering Him by calling Him the Supreme Personality of Godhead, the Absolute Truth. Whatever Arjuna says in these two verses is confirmed by Vedic truth. Vedic injunctions affirm that only one who takes to devotional service to the Supreme Lord can understand Him, whereas others cannot. Each and every word of this verse spoken by Arjuna is confirmed by Vedic injunction.
In the  Kena Upaniṣad  it is stated that the Supreme Brahman is the rest for everything, and Kṛṣṇa has already explained that everything is resting on Him. The  Muṇḍaka Upaniṣad  confirms that the Supreme Lord, in whom everything is resting, can be realized only by those who engage constantly in thinking of Him. This constant thinking of Kṛṣṇa is  smaraṇam , one of the methods of devotional service. It is only by devotional service to Kṛṣṇa that one can understand his position and get rid of this material body.
In the  Vedas  the Supreme Lord is accepted as the purest of the pure. One who understands that Kṛṣṇa is the purest of the pure can become purified from all sinful activities. One cannot be disinfected from sinful activities unless he surrenders unto the Supreme Lord. Arjuna's acceptance of Kṛṣṇa as the supreme pure complies with the injunctions of Vedic literature. This is also confirmed by great personalities, of whom Nārada is the chief.
Krṣṇa is the Supreme Personality of Godhead, and one should always meditate upon Him and enjoy one's transcendental relationship with Him. He is the supreme existence. He is free from bodily needs, birth and death. Not only does Arjuna confirm this, but all the Vedic literatures, the  Purāṇas  and histories. In all Vedic literatures Krṣṇa is thus described, and the Supreme Lord Himself also says in the Fourth Chapter, "Although I am unborn, I appear on this earth to establish religious principles." He is the supreme origin; He has no cause, for He is the cause of all causes, and everything is emanating from Him. This perfect knowledge can be had by the grace of the Supreme Lord.
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