The Quran: An Abiding Wonder

Many revelations had been made by God and committed to writing by His devotees before the advent of the Qur'an. Then what particularly distinguishes the sacred Islamic text from its forerunners? It is not just that it is complete and the other revealed books incomplete. To categorise the sacred scriptures in this way would amount to discriminating between the Prophets themselves which is certainly not right.
What then is its great distinguishing feature? There is only one. A simple, but a ma...