﴿ وَلَئِنْ أَذَقْنَٰهُ رَحْمَةًۭ مِّنَّا مِنۢ بَعْدِ ضَرَّآءَ مَسَّتْهُ لَيَقُولَنَّ هَٰذَا لِى وَمَآ أَظُنُّ ٱلسَّاعَةَ قَآئِمَةًۭ وَلَئِن رُّجِعْتُ إِلَىٰ رَبِّىٓ إِنَّ لِى عِندَهُۥ لَلْحُسْنَىٰ ۚ فَلَنُنَبِّئَنَّ ٱلَّذِينَ كَفَرُوا۟ بِمَا عَمِلُوا۟ وَلَنُذِيقَنَّهُم مِّنْ عَذَابٍ غَلِيظٍۢ ﴾

“Yet whenever We let him taste some of Our grace after hardship has visited him, he is sure to say, “This is but my due!” - and, “I do not think that the Last Hour will ever come: but if [it should come, and] I should indeed be brought back unto my Sus­tainer, then, behold, the ultimate good awaits me with Him! But [on the Day of Judgment] We shall most cer­tainly give those who were bent on denying the truth full understanding of all that they ever did, and shall most certainly give them [thereby] a taste of suffering severe.”

The moment of crisis for a man is the moment of self-discovery. So, when he is confronted with adversity, he forgets self-conceit and starts remembering God. At that time, he realises that he is the subject or servant of God and God is his Deity. But, when God gives him relief from his trouble and blesses him with amenities, he immediately forgets his earlier position. He links the grace of God bestowed upon him with the cause-and-effect chain and considers it to be result of his own devices and abilities. He develops a perverse mentality according to which he thinks that the only life is that of this world, and that there will be no reckoning in the Court of God. Furthermore, his prosperity leads him into the misunderstanding that since he is well-off here, he will definitely be well-off in the hereafter also.