Whoever thinks that Lord Allah will not help him in this world and the Hereafter, let him ascend to the sky using a rope and then cut off it, and let him see that his plan will remove his rage?
The disbelievers during the period of Messenger Muhammad thought that the Lord is not giving him any help from Paradise; so this verse is a reply to those who keep such evil thoughts.
Today, Adhikr which is the Unbreakable Rope extended from Paradise to earth as explained in verse 2: 256 is codified as the Splendid Book. So whoever holdfasts Adhikr, It will safeguard him from all calamities, disasters, diseases, and Hell as explained in verse 5: 48. Fujjar who hide and reject Adhikr do not believe in any Messenger or Prophet, instead, they are following 29 pseudo-prophets and are hurrying for the Antichrist and Doomsday as explained in verse 15: 85. See explanation 3: 119; 4: 63; 6: 35 and 15: 87.