أَوَلَمْ يَرَوْا أَنَّ اللَّهَ يَبْسُطُ الرِّزْقَ لِمَن يَشَاءُ وَيَقْدِرُ ۚ إِنَّ فِي ذَٰلِكَ لَآيَاتٍ لِّقَوْمٍ يُؤْمِنُونَ (37)
(30:37) Do they not see that Allah enlarges and straitens the sustenance of those whom He pleases? There are Signs in this for those who believe. *56
*56) That is, "The believers can learn how disbelief and shirk affect man's morality and what is the impact of belief in Allah on his morals. The person who sincerely believes Allah and looks upon Him as the Master of the treasure-houses of provisions, can never be involved in meanness, in which those forgetful of God are involved. If he is given abundantly he will not be puffed up; he will rather be grateful to Allah, will treat his fellowmen generously and benevolently, and will expend 'his God-given wealth for His sake. On the other hand, he will exercise patience; he will never gamble away his honesty and self-respect, but will have hope of Allah's bounty till the last. Such a moral excellence can neither fall to the lot of an atheist nor of a polytheist."