(Purport to BG 10.12-13 continued)
In the Kena Upanishad it is stated that the Supreme Brahman is the rest for everything, and Krishna has already explained that everything is resting on Him. The Mundaka Upanishad 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 Krishna is smaranam, one of the methods of devotional service. It is only by devotional service to Krishna 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 Krishna 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 Krishna as the supreme pure complies with the injunctions of Vedic literature. This is also confirmed by great personalities, of whom Narada is the chief.
Krishna 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 Puranas and histories. In all Vedic literatures Krishna 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 Krishna. If we want to understand Bhagavad-gita, we should accept the statements in these two verses. This is called the parampara system, acceptance of the disciplic succession. Unless one is in the disciplic succession, he cannot understand Bhagavad-gita. 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 Krishna is an ordinary person.
Translation and commentary by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada