Not only from the point of view of eloquence, but also, as we have seen, in the fields of human ideas and society, and for all levels of understanding, the Qur'an is a miracle. For rhetoricians it has its eloquence, for philosophers its wisdom, and for scientists its different kinds of knowledge. For all these reasons the Qur'an addresses all people and says: "If you say this book is the word of man, bring its like and its equal."
"Say: If man and jinn banded together to produce the like of this Qur'an, they would never produce its like, not though they back one another." (XVII: 88)
"Or do they say: 'He has forged it.'? Say: 'Then bring you ten surahs the like of it, forged; and call upon whom you are able, apart from Allah, if you speak truly.' Then if they do not answer you, know that it has been sent down with Allah's knowledge, and that there is no god but He." (XI: 13-14)
"And if you are in doubt about what We have sent down on Our servant, then bring a Surah like it." (II: 23)
But we see from the testimony of history from then till now no one has had the courage to do this and produce its like. Of course, during the time of Muhammad (S.A.) and after his death, some Arabs, like Musailemah, Sajah and Ibn Abi'l-'Awja', planned to challenge it but they were not able, and eventually confessed to their incapacity. In the time of the Prophet (S.A.), the enemies of Islam, who used the most awful means in their work, torturing the Muslims, laying economic boycotts on them, plotting to kill Muhammad (S.A.), and so forth, had no one who could do a simple thing like bringing one surah like the Qur'an. In the present day, too, those who spend millions of dollars trying to destroy Islam would certainly attack it in this inexpensive and easy way (bringing a surah like the Qur'an) if they could. If they had been able to do that up to now, it would have been a victory for them and the end of Islam and the news would have been blown on all the trumpets of the world's newsmen.
In the end it is necessary to remind ourselves that if we get to know the Qur'an, or get to know it better and put its great, magnificent and precise project into action, greatness will be ours, and more. The huge edifice of our, the Muslims, greatness collapsed when we stopped putting the commands of this heavenly book into practice. So we fell down, we were satisfied only with the name of Islam. Our departed greatness will return when we leave this crooked way and, starting again, become new Muslims and put the Qur'an at the top of the sights of our hearts and our wisdom, and make it an example for life, as the Prophet said: "When calamities encompass you like the darkness of the night, reach for the Qur'an." (Usul al-Kafi, vol. 2, p. 599)
source : http://www.maaref-foundation.com