God has set the Quran apart through its distinct arrangement, style and structural unity, as well as through its contents, the ease with which it can be memorized, its impact, and the inability of its contemporaries, or anyone else for that matter, to meet the challenge to produce something comparable to it. He has declared the Quran above doubt and suspicion, free of contradiction and, hence, of indisputable reliability, its verses clear and unambiguous. The Quran's authenticity does not depend, nor should it depend, on any narrative, however well-attested it might happen to be. Its definitive certainty is founded on the fact that it is the speech of God to which no falsehood can gain access in any way whatsoever. The Prophet received it through Gabriel, and as he began reciting it to others at God's command, he inspired in them the desire to memorize and recite it, to teach it and circulate it both orally and in writing. Yet it was God who undertook to gather it together in the Prophet's mind, causing him to recite it properly, making its meanings clear, and preserving it.