>And if you are in doubt about what We have revealed to Our servant, then produce a chapter like these, and call your witnesses apart from God, if you are truthful. [ Verse [2.23 ][1] ]

But, humans have failed to fulfill this challenge. 

So, what qualities do the Suras have that failed the mankind from meeting the challenge?


  [1]: http://quranx.com/2.23
  [2]: http://www.islamhouse.com/138063/en/en/articles/The_Challenge_of_the_Quran