Viswamithra comes to take Rama with him on his quest to Sidhasrama in "Rama's Initiation". This reveals that Rama has been chosen because instead of requiring for the king himself he asks for his son Rama. Rama does not have much of a choice becoming a hero because the sage puts him in the situation to become a hero.
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If you start whooping your child for the smallest reasons or for no reason at all.
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The ship wrecked sailors had been isolated for decades.
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