Or are the people of the cities secure about Our torments coming to them in daylight while they are playing?
It is told in verses 16: 45- 47: "Then are those who plot for evil thinking secure that Lord will not make them swallow with the earth, or the punishment will not come in a way that they are not perceiving it, or they will not be seized in their dazzling, they will not be triumphant. Or they will not be seized in their fearing time, indeed your Lord is Kind and Merciful". It is asked through verses 67: 16-17: "Do you feel secure that the One in heaven wouldn't cause the earth to swallow you and suddenly it would sway? Or do you feel secure that the One in heaven wouldn't send against you a storm of stones? Then you would know how was My warning".
Since Adhikr is codified as the Best Interpretation of Lord's Book through the Three-Time-Knower mentioned in verse 25: 59, the Arabic Quran reading Fujjar who hide even the forty names of Adhikr will have disgrace in this world and severe punishment in the Hereafter as explained in verse 2: 85. See explanation 7: 4-5.