A. Yusuf Ali:Translation:
When we give him a taste 4522 of some Mercy from
Ourselves, after some adversity has touched him, he is
sure to say, "This is due to my (merit): I think not that
the Hour (of Judgment) will (ever) be established; but
if I am brought back to my Lord, I have (much) good
(stored) in His sight!" But We will show the
Unbelievers the truth of all that they did, and We shall
give them the taste of a severe Penalty.

Muhammad Asad:Translation:
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: 43 but if [it should come, and] I should indeed be brought back unto my Sustainer, then, behold, the ultimate good awaits me with Him! 44 But [on the Day of Judgment] We shall most certainly give those who were bent on denying the truth 45 full understanding of all that they ever did, and shall most certainly give them [thereby] a taste of suffering severe. 46
4522 When men entertain false ideas of values in life, there are two or three possible attitudes they may adopt in reaction to their experiences. In the first place, their desire may be inordinate for the good things of this life, and any little check brings them into a mood of despair. See last note. In the second place, if their desire is granted, they are puffed up, and think that everything is due to their own cleverness or merit, and they forget Allah. Not only that, but they go a step further, and begin to doubt a Hereafter at all! If by chance they have a faint glimmering of the Hereafter, which they cannot help recognising, they think themselves "favoured of Heaven", because of some small favours given to them in this life by way of trial. Thus they turn all things, good or evil, away from their real purpose, because they are devoted to falsehood.