Explained in detail · 50

وَلَئِنۡ أَذَقۡنَٰهُ رَحۡمَةࣰ مِّنَّا مِنۢ بَعۡدِ ضَرَّآءَ مَسَّتۡهُ لَيَقُولَنَّ هَٰذَا لِي وَمَآ أَظُنُّ ٱلسَّاعَةَ قَآئِمَةࣰ وَلَئِن رُّجِعۡتُ إِلَىٰ رَبِّيٓ إِنَّ لِي عِندَهُۥ لَلۡحُسۡنَىٰۚ فَلَنُنَبِّئَنَّ ٱلَّذِينَ كَفَرُواْ بِمَا عَمِلُواْ وَلَنُذِيقَنَّهُم مِّنۡ عَذَابٍ غَلِيظࣲ‏

When we give him a taste 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