Charles Spurgeon Commentary Romans 3:23-26

"for all have sinned, and fall short of the glory of God; being justified freely by his grace through the redemption that is in Christ Jesus: whom God set forth [to be] a propitiation, through faith, in his blood, to show his righteousness because of the passing over of the sins done aforetime, in the forbearance of God; for the showing, [I say], of his righteousness at this present season: that he might himself be just, and the justifier of him that hath faith in Jesus." — Romans 3:23-26 (ASV)

For all have sinned, and come short of the glory of God; Being justified freely by his grace through the redemption that is in Christ Jesus: Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God: To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.

Where is boasting then? It is excluded. It is shut out. If men are saved not at all by works, but altogether by the free grace of God through the merits of Christ, then boasting has the gate shut in its face. But by what law is boasting shut out?