Shyam Dodge, writing at YogaBrains:
In the Bhagavad Gita the blind king, Dhritarashtra, and his secretary Sanjaya form the bookends for the dialog between Krishna and Arjuna. In the manner of epic poetry the drama of the Gita’s two protagonists is a narrative within a narrative within a narrative (etc). The blind king is the father of the brother-warriors opposing Arjuna and is therefore the father of those who oppose Bhagwan Sri Krishna (otherwise known, within the text, as an incarnation of god on earth).
Dhritarashtra longs to know what is happening on the battlefield where he fears his sons will die. He asks his secretary, a seer, to tell him the fate of his sons and to describe the human theatre unfolding on the battlefield. The story of Arjuna’s crisis on the field of kurukshetra is therefore narrated by Sanjaya, who closes his eyes and through mystic insight becomes a nearly omniscient witness to the dialog between the warrior and the god-man.