God enlarges the provision or restricts it based on His own criteria, providing insights for the believers!

Verses 49-52 of Chapter 39:

Man is such that when a little affliction touches him, he calls upon Us, and when We bestow Our favor on him, he says, "I have been given this because of my knowledge!" Nay, it is a trial, but most of them do not know. The same was said also by those who went before them, but whatever they earned did not avail them anything. So, they met the evil consequences of their deeds, and the wicked ones among these people, too, shall soon meet the evil consequences of their deeds. They cannot frustrate Us. And do they not know that Allah provides abundantly for whom He wills and sparingly for whom He wills? In this there are signs for those who believe.

Who accept the advice from the revelations of God's Book?

Verse 29 of Chapter 38

This is a Book which We have sent down upon you, a blessed Book, for them to ponder upon its verses, and for men of intellect to accept advice.

Those who believe and do good deeds are few!

Verse 24 of Chapter 38:

(David) said: He hath wronged thee in demanding thine ewe in addition to his ewes, and lo! many partners oppress one another, save such as believe and do good works, and they are few. And David guessed that We had tried him, and he sought forgiveness of his Lord, and he bowed himself and fell down prostrate and repented.