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There aren't so many instructions in Sri Guru Granth Sahib Ji. A lot of it is social commentary and thoughts about that. It's about perceiving Ik Onkar here and now and describing the joy of that experience. Quran is indeed a scripture of instructions and stories, but that is not Gurbani's focus. Poetry is really the most ideal way to bring people to the type of understanding and perspective Guru Sahib was talking about.