'Abd al-Jabbar (935 - 1025)

"Though the challenge can be made sound be made sound by a certain level of
eloquence and rhetoric, it is more conspicuous and evident for the sublime to be
composed in a manner that is not habitual. Since that is so, Allah (God) has
made the Qur'an in this unusual manner, and has endowed it with the distinction
of a unique form used neither in their prose nor in their poetry and to a high
level of eloquence in order to illustrate its inimitability."