Just as David also speaks of the blessing of the one to whom God counts righteousness apart from works: 7 “Blessed are those whose lawless deeds are forgiven, and whose sins are covered; 8 blessed is the man against whom the Lord will not count his sin.” (Romans 4:6-8 (ESV)
Paul quotes a couple Psalms to make his point that what he preaches is something that the OT already teaches. It isn’t anything new. God justifies the ungodly. God forgives sins. God does not hold our sins against us. Blessed are those whose lawless deeds are forgiven.
The question I suppose one has here is, who are “those?” You are those. It is your lawless deeds that God forgives. We automatically though, run into a catch 22. Our sinful natures want our lawless deeds to be forgiven, we want their lawless deeds to be punished. In this world lawless deeds are punished. Even your lawless deeds find punishment and earthly retribution more often than not. The old saying that what comes around goes around is for the most part true. Sometimes we escape direct retribution but then we find things happening to us for no apparent reason, and sometimes you wonder if it isn’t somehow retribution for whatever it was that you did and kept hidden since you were 12 or whatever. This isn’t talking about earthly consequences for our actions. It is talking about something far more severe, the eternal consequences of our actions. And what we deserve is what they deserve, and none of us would wish that on our worst enemy’s dog as the saying goes. God doesn’t wish it on you either. For this reason he sent his Son to die for you, that you would be blessed and being blessed be forgiven.