Allah Subhanahu wa Ta'ala says (Qur'an Translation): (The grandeur of the Qur'an is such that) Had we sent down the Qur'an on a mountain, you would surely have seen it humbling itself and rent asunder by the fear of Allah. (Alas, hard hearted man is not affected by the words of the Qur'an) (Al-Hashr: 21)