وَبِالْحَقِّ أَنزَلْنَاهُ وَبِالْحَقِّ نَزَلَ ۗ وَمَا أَرْسَلْنَاكَ إِلَّا مُبَشِّرًا وَنَذِيرًا (105)
(17:105) We have sent down the Qur'an with the truth and with the truth it has come down; and O Muhammad, We have sent you only to give good news (to the Believers) and warning (to the disbelievers). *118
*118) That is, "It is not your responsibility to cause, in a supernatural manner, springs to gush forth or gardens to grow or pieces of the sky to fall down in order to convince those people who do not fudge the Qur'an by its teachings nor decide between the Truth and falsehood on merit. As the Qur'an has been sent down with truth, you should present it before the people and tell them plainly that the one, who believes, does so for his own good and the one who rejects it, does it at his own peril."