Pointless to Warn

For those who respond to their Lord is the best reward. But those who do not respond, if they possessed all the treasures of the earth, they would offer them as ransom. For them is a severe reckoning

13:18For those who answered Allah's call is bliss; and for those who answered not His call, if they had all that is in the earth, and therewith the like thereof, they would proffer it as ransom. Such will have a woeful reckoning, and their habitation will be hell, a dire abode.