Sanskrit for 'The Song of God,' it is a poem found in Book Six of the Hindu epic Mahabharata. Likely formalized in the 1st or 2nd century, the Bhagavad-Gita begins on the eve of a battle, when the prince Arjuna asks his charioteer Krishna (an avatar of Vishnu) about responsibility in dealing with the suffering that the impending battle will cause. Krishna tells Arjuna that humans possess a divine self within a material form, and that Arjuna's duty is to love God and do what is right without thinking of personal gain — some of the main tenets of Hinduism.