The Gita is a dialogue between the warrior-prince Arjuna and the god Krishna who is serving as his charioteer at the Battle of Kurukshetra fought between Arjuna’s family and allies (the Pandavas) and those of the prince Duryodhana and his family (the Kauravas) and their allies. This dialogue is recited by the Kauravan counselor Sanjaya to his blind king Dhritarashtra (both far from the battleground) as Krishna has given Sanjaya mystical sight so he will be able to see and report the battle to the king.
The Kauravas and Pandavas are related and there are mutual friends and family members fighting on both sides for supremacy of rule. Accordingly, when Arjuna sees all his former friends and comrades on the opposing side, he loses heart and refuses to take part in a battle which will result in their deaths as well as many others. The rest of the text is the dialogue between the prince and the god on what constitutes right action, proper understanding and, ultimately, the meaning of life and nature of the Divine.
The Gita combines the concepts expressed in the central texts of Hinduism – the Vedas and Upanishads – which are here synthesized into a single, coherent vision of belief in one God and the underlying unity of all existence. The text instructs on how one must elevate the mind and soul to look beyond appearances – which fool one into believing in duality and multiplicity – and recognize these are illusions; all humans and aspects of existence are a unified extension of the Divine which one will recognize once the trappings of illusion have been discarded.
The Gita inspired the Bhakti (“devotion”) Movement which then influenced the development of Buddhism, Jainism, and Sikhism. Krishna explains the path of selfless devotion as one of the paths toward self-actualization, recognition of the truth of existence, and liberation from the cycle of rebirth and death; the other two being jnana (“knowledge”) and karma (“action”).