Human existence is not entirely defined by its gross appearance alone. It is a complex, deeply integrated composite of gross body and subtle inner being or the Suksma Sárıra. At another level of aggregation, gross body is constituted of several organs and systems functioning in perfect harmony with one another with the common goal of preserving healthy functioning and vitality of Sthula Sárıra. Similarly, Suksma Sárıra too, has its own subtle constituents, viz., Kama, Krodha, Lobha, Moha, Ahamkara, Mana, Buddhi and so on. Tackling constituents of subtle entity poses an enormous challenge even for the profoundly enlightened ones.
Every equipment that matters in life is invariably accompanied by a technical manual to answer all queries pertaining to all its features, efficient performance as well as how to service in the event of breakdown. Wisdom of Srı Krsna imparted unto His disciple-friend in the battlefield of Kuruksetra at the pinnacle of his dejection and perceived cowardice, is a marvellous 'Service Manual' of human existence. Mystical and exquisite, it is so comprehensive, so far-reaching in its intent and content, that Arjuna discovered an altogether refined, evolved Arjuna within himself, entirely unknown to him hitherto. Transformation thus achieved, did not cease within confines of the battlefield. It carried him along up to the goal of human existence, i.e., ultimate emancipation known as Moksa after leading a glorious life as a cosmic traveller in this delusionary world of Maya.