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Krishna, the superhuman which is Lord Vishnu himself take a birth to protect the humans and left the guidelines for the humans, delivered the Bhagwad Gita on the battlefield to Arjun when he was reluctant to kill his own kin. Krishna represents love, wisdom, intellect and his speech on the battlefield for Arjuna, the 700 verses of the Bhagwad Geeta contain a vast sea of knowledge. It gives us the message to keep doing our duty without worrying about the result.
source: Bhagavad gita As It Is
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