Book excerpt: The Bhagavad-gita is the main source-book on yoga and a concise summary of India's Vedic wisdom. Yet remarkably, the setting for this classic of spiritual literature is an ancient Indian battlefield. At the last moment, the great warrior Arjuna begins to wonder about the real meaning of his life. In the Bhagavadgita, Lord Krsna brings His disciple from perplexity to spiritual enlightenment. Bhagavad-gita As It Is is the largest-selling, most widely used edition of the Gita in the world.