"It is like a sacrament ever on the lips...
For its words are not mere words. They are, 'the twigs of the burning bush aflame with God'.
They recite it constantly through the daily round, at prayer times, through the passage of the year, and through all the stages of life. They strive to learn as much of it as possible by heart. It is not given to many to learn to recite the whole of the Book, and the title thus won by those who do is greatly respected.
The Quran is more central to Islamic theology than the Bible is for Christians."
Francis Robinson, "Islam and the Impact of Print"