وَلَوْ جَعَلْنَاهُ قُرْآنًا أَعْجَمِيًّا لَّقَالُوا لَوْلَا فُصِّلَتْ آيَاتُهُ ۖ أَأَعْجَمِيٌّ وَعَرَبِيٌّ ۗ قُلْ هُوَ لِلَّذِينَ آمَنُوا هُدًى وَشِفَاءٌ ۖ وَالَّذِينَ لَا يُؤْمِنُونَ فِي آذَانِهِمْ وَقْرٌ وَهُوَ عَلَيْهِمْ عَمًى ۚ أُولَٰئِكَ يُنَادَوْنَ مِن مَّكَانٍ بَعِيدٍ (44)
(41:44) Had We revealed this as a non-Arabic Qur'an they would have said: 'Why were its verses not clearly expounded? How strange, a non-Arabic scripture and an Arab audience!' *54 Tell them: 'It is a guidance and a healing to the believers. But to those who do not believe, it serves as a plug in their ears and a covering over their eyes. It is as if they are being called from a place far away. *55
*54) This is the kind of the stubbornness that the Holy Prophet was confronting. The disbelievers said, "Muhammad (upon whom be Allah's peace) is an Arab. Arabic is his mother tongue. How can one believe that the Arabic Qur'an that he presents has not been forged by himself but has been revealed to him by God? The Qur'an could be believed to be the Revelation of God if he had started speaking fluently in a foreign language unknown to him, like Persian, Latin, or Greek. " This argument of theirs has been refuted by Allah, saying, "Now when the Qur'an has been sent down in their own tongue so that they may understand it, they raise the objection: Why has it been sent down to an Arab in Arabic? But if it had been sent down in a foreign tongue, these very people would have said, `How strange! An Arab Messenger has been sent to the Arabs, but the Revelations being sent to him are in a tongue which is neither understood by him nor by his people. "
*55) When a person is summoned from afar, he hears a voice but dces not understand what is being said to him. This is a wonderful simile which filly depicts the psychology of the stubborn opponents. Naturally when you talk to a person who is free from prejudice, he will listen to you, will try to understand what you say, will accept it if it is reasonable, with an open mind. On the contrary, the person who is not only prejudiced against you but is also malicious and spiteful, will not at all listen to you however hard you may try to make him understand your viewpoint. In spite of hearing you all the time he will not understand at all what you had been saying.