Rejection of the Qur'an is pure Stubbornness

Allah tells us that the Qur'an is so eloquent and perfect in its wording and meanings, yet despite that the idolators do not believe in it. He tells us that their disbelief is the disbelief of stubbornness, as He says elsewhere:

وَلَوْ نَزَّلْنَـهُ عَلَى بَعْضِ الاٌّعْجَمِينَ

أَأَعْجَمِيٌّ وَعَرَ‌بِيٌّ (Is it a non- Arabic [ book ] and an Arab [ messenger ]? - 44) The original word used for non-Arabic in the text is a'jamiyy (with hamza before the letter 'ain) which is an Arabic term for ` ineloquent speech', while ` ajam' (without hamzah in its beginning) means any nation other than Arabs. Therefore ` ajamiyy is a person who is non-Arab, even though he may speak eloquently, and a'jamiyy is a person who cannot speak eloquently (Qurtubi). The use of the word أَعْجَمِيٌّ ajamiyy in this verse means that if We had revealed the Qur'an in any language other than Arabic, then the Quraysh who are the first addressees of the Qur'an would have complained that they did not understand this Book and would have said wonderingly that the prophet is an ` Arab, but the book is ajamiyy which is ineloquent.

قلْ هُوَ لِلَّذِينَ آمَنُوا هُدًى وَشِفَاءٌ (Say, "For those who believe, it is guidance and cure. - 44) Two attributes of The noble Qur'an are stated here. One is that Qur'an gives guidance - such guidance in all spheres of life as is beneficial and useful for human beings. The second attribute is that the Qur'an is cure. That it is a cure for spiritual ailments like kufr, shirk, arrogance, jealousy, greed, etc. is quite obvious, but is also cure for bodily ailments, as has been proved by experience of treating patients through Qur'anic prayers which has been successful.