You have a right to the deeds, never to the fruits. If you can perform your deeds but are holy indifferent to the results of your actions, you will not build up any karma and you will not be rebom. Fight because you are a warrior, but don't mind what happens or who wins. On action alone be thy interest, never on its fruits. A fourth method for reaching moksha was the yoga of devotion or bhakti yoga.
Devotion alone holds the key.
Arjuna was not convinced, so Krishna finally revealed his true identity to the warrior. Krishna was really divinity who had taken the form of a charioteer to help the Pandavas re-establish righteousness. His revelation was like the light of a thousand suns in the sky. As Arjuna looked at him, he saw all the world, all the gods, the universe, the One. Filled with awe, Arjuna agreed to fight.