Аль-Ахкаф 46:8

In ancient Arabia, the addressees of the Quran were too preoccupied by the greatness of their forebears to give its message any proper consideration. They said that it distressed them even to hear it, because it ran counter to the religion of their august predecessors and, on this account, they rejected it. But the Quran had another aspect to it and that was its literary supremacy. Every Arabic linguistic expert has felt that it is an extraordinary work. It is true that the works of certain human beings possess extraordinary literary value, but there is a limit to the merit of a composition by an ordinary mortal. Indeed, the literary majesty of the Qur’an is inconceivably greater than any possible feat of the human mind. In order, therefore, to lessen the importance of the Quran from this angle, its detractors held that it was magic, i.e. it was a feat of magical presentation and not a sublime rendering of facts. When opponents stoop to obduracy, any serious person would remain silent after saying, ‘The issue between you and me is now before God for His decision.’ This is not defeatism but a forward-looking strategy. If one remains silent before an obstinate person, one actually distances oneself from the dispute and that brings one’s opponent face to face with his own conscience, so that if there is any feeling of rectitude left in him, it should be aroused.