Why Lord shiva is the most powerful GOD?
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From Mahimna Strotra
महेशान्नापरो देवो महिम्नो नापरा स्तुतिः।
अघोरान्नापरो मन्त्रो नास्ति तत्त्वं गुरोः परम्॥३७॥
There is no god (devaḥ) that is higher (aparaḥ) than Mahesha --an epithet of Siva meaning "great Lord"-- , there is no hymn of praise (stutiḥ) which is higher than (this) Sivamahimnaḥ stotram . There is no Mantra --a sacred word-- which is higher than Aghora --an epithet of Shiva meaning "not terrific"-- (and) there is no principle (tattvam) that is superior to the Guru --in the sense of the fifth "kṛtya" or action of Śiva, which bestows divine Grace upon a limited being-- ||37||