As it is stated in the previous chapter, the Supreme Personality of Godhead is covered by His yoga-maya. Only surrendered souls and devotees can see Him. Now Arjuna is convinced that His friend, Krishna, is the Supreme Godhead, but he wants to know the general process by which the all-pervading Lord can be understood by the common man. No common men, including the demons and atheists, can know Krishna because He is guarded by His yoga-maya energy. Again, these questions are asked by Arjuna for their benefit. The superior devotee is not only concerned for his own understanding, but for the understanding of all mankind. Out of his mercy, because he is a Vaisnava, a devotee, Arjuna is opening the understanding for the common man as far as the all-pervasiveness of the Supreme is concerned. He addresses Krishna specifically as yogin because Sri Krishna is the master of the yoga-maya energy by which He is covered and uncovered to the common man. The common man who has no love for Krishna cannot always think of Krishna; therefore he has to think materially. Arjuna is considering the mode of thinking of the materialistic persons of this world. Because materialists cannot understand Krishna spiritually, they are advised to concentrate the mind on physical things and try to see how Krishna is manifested by physical representations.