The Criterion
In the name of God, Most Gracious, Most Merciful.[25:6]
Say: "The (Qur’an) was sent down by Him who knows the mystery (that is) in the heavens and the earth: verily He is Oft-Forgiving, Most Merciful."

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* v.6 : The answer is that the Qur-in teaches spiritual knowledge of what is ordinarily hidden from men’s sight, and such knowledge can only come from Allah, to Whom alone is known the secret of the whole Creation. In spite of man’s sin and shortcomings, He forgives, and He sends His most precious gift, i.e., the revelation of His Will.