Allah enlarges the provision for whom He wills and straitens (it for whomever and whenever He wills). And they are happy with the life of this world and the life of this world, compared to the hereafter, is nothing but (temporary) enjoyment. (R 3)
There are many highly qualified people who do not earn enough money to support their families while on the other hand, there are many illiterates who earn in lakhs. Some people work very hard to earn their livelihood while others enjoy life through the wealth they inherited from their forefathers without putting in any effort. This clearly proves that earning of wealth is not in accordance with one’s qualification or labour but in accordance with the will of Allah (SWT) He makes whomever He wills rich and whomever He wills poor. The enjoyment of the infidels in the life of this world is temporary while the enjoyment of the believers in the hereafter is ever lasting.