The purpose of Bhagavad-gītā is to deliver mankind from the nescience of material existence. Every man is in difficulty in so many ways, as Arjuna also was in difficulty in having to fight the Battle of Kurukṣetra. Arjuna surrendered unto Śrī Kṛṣṇa, and consequently this Bhagavad-gītā was spoken. More @Wikipedia
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