The Bhagavad-Gita opens with blind King Dhritarashtra requesting his secretary, Sanjaya, to

narrate the battle between his sons, the Kauravas, and their cousins, the Pandavas. Lord Krishna, out of affection for His devotee, the Pandava prince Arjuna, has agreed to drive his chariot.

As Arjuna takes up his bow and prepares to fight, he sees the sons of Dhritarashtra drawn in military array and requests Krishna to draw his chariot between the two fighting forces.

In the midst of both armies, Arjuna’s mind reels as he foresees the imminent death of his teacher, relatives, and friends. He throws down his bow and arrows and decides not to fight.

In the beginning of Chapter Two, Arjuna presents his arguments for refusing to fight. He fears the sinful reactions of killing. But after Arjuna surrenders to Lord Krishna and requests the Lord to instruct him, the Lord begins countering Arjuna’s objections.

First, Krishna analytically explains that fighting in His service is transcendental and will bring no sinful reaction. Krishna also explains the Vedas’ purpose as to gradually elevate souls to Krishna consciousness and thus encourage him to fight and ignore his mind’s desires.

Lord Krishna then glorifies both ‘buddhi-yoga’, intelligence used in spiritual advancement of knowledge. Arjuna instead prefers to perform ‘buddhi-yoga’ as an excuse to retire the battlefield for a life of contemplation. — Bhagavad-gita.us