In this concluding section of Chapter III, Arjuna asks a question as to what is it that drives man to commit sinful acts? Lord Krishna in his reply, neatly wraps up the chapter by folding it onto the previous chapter. He says that it is Desire (& its derivative - Anger) that drive a man to commit sin. The Desires are located in the senses, the mind and the intellect and the way to defeat the enemy "Desire" is to establish oneself in the Self!