How can one distinguish between the eloquence of the Qur'an and the eloquence of Al-Mutanabbi’s poetry, and how is the rhetorical miraculousness of the Qur'an known?

The eloquence of the Holy Qur’an cannot be compared to the poetry of Al-Mutanabbi. The Qur’an is a miracle, and Allah challenged jinn and humans to produce its like, but they failed, whereas Al-Mutanabbi’s poetry has been criticized and its flaws highlighted. The miraculous nature of the Qur’an lies in its wording, meaning, eloquence, rhetoric, and style, in its ability to convey profound meanings with the most concise expressions, in its prophecies of the unseen, and in its tremendous impact on hearts and souls.