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Surah 41. Fussilat
Ayah 49 - 50
49لَّا يَسْـَٔمُ ٱلْإِنسَـٰنُ مِن دُعَآءِ ٱلْخَيْرِ وَإِن مَّسَّهُ ٱلشَّرُّ فَيَـُٔوسٌ قَنُوطٌ
50وَلَئِنْ أَذَقْنَـٰهُ رَحْمَةً مِّنَّا مِنۢ بَعْدِ ضَرَّآءَ مَسَّتْهُ لَيَقُولَنَّ هَـٰذَا لِى وَمَآ أَظُنُّ ٱلسَّاعَةَ قَآئِمَةً وَلَئِن رُّجِعْتُ إِلَىٰ رَبِّىٓ إِنَّ لِى عِندَهُۥ لَلْحُسْنَىٰ ۚ فَلَنُنَبِّئَنَّ ٱلَّذِينَ كَفَرُوا۟ بِمَا عَمِلُوا۟ وَلَنُذِيقَنَّهُم مِّنْ عَذَابٍ غَلِيظٍ
[49-50] Man is never wearied of praying for good,65 and when an evil befalls him, he loses hope and becomes desperate. But when We let him taste Our mercy after the hardship, he says, "I deserve this,66 and I do not think that the Hour (of Resurrection) will ever come. But if I am really brought back to my Lord, I shall have good reward with Him, too. " The fact, however, is that We shall certainly tell the disbelievers what they had done, and We shall make them taste a most degrading Chastisement.
65"For good": For prosperity, abundance of provisions, good health, well-being of children, etc. And "man" here does not imply every human being for it also includes the prophet and the righteous people , who are free from this weakness as is being mentioned below But here it implies the mean and shallow person who stars imploring God humbly when touched by harm and is beside himself with joy when he receives the good things of life As most human beings are involved in this weakness ,it has been called a weakness of man.
66That is "I have got all this because of my being worthy of it :it is my right that I should receive all this."