And We send not the Messengers except as giver of glad tidings and warners. But those who disbelieve, dispute with false argument, in order to refute the truth thereby. And they treat My Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.), and that with which they are warned, as jest and mockery!

And who does more wrong than he who is reminded of the Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) of his Lord, but turns away from them forgetting what (deeds) his hands have sent forth. Truly, We have set veils over their hearts lest they should understand this (the Quran), and in their ears, deafness. And if you (O Muhammad SAW) call them to guidance, even then they will never be guided.