The living God is a discriminating God. He makes distinctions between those who know him and love him and serve him, and those who are far from him – there are only really these two classes of human beings in the world that matter.
From the perspective of the sinner, all labour is worthless and futile, for while he thinks that he is working for himself and storing up treasure for his own enrichment, in reality he is doing it for another. What is more, this other is probably the last person that he would like his riches to go to. When God takes the wealth of the wicked and redistributes it to his favourites, he is putting the final seal on the worthlessness of the lives of the wicked. For, having deliberately rejected all spiritual good and having set their sights on earthly riches alone, they focus entirely on obtaining these. They sacrifice everything else to get them. They know that they have forfeited heaven but they count that as worthless. As far as they are concerned, the righteous can keep their future spiritual reward; they will have their reward in the here-and-now. It is then the ultimate bitterness for them that God takes what they sacrificed their eternal souls for, and give it instead to those who did no work to obtain it, but rather lived to please the Lord. This, to the wicked, is vexation of spirit. All their labour is turned into service for their enemies. This redistribution of wealth takes place to some extent in this world, but in its fullness is in the future.