Rom 3:21-24
"But now the righteousness of God has been manifested apart from the law, although the Law and the Prophets bear witness to it— the righteousness of God through faith in Jesus Christ for all who believe. For there is no distinction: for all have sinned and fall short of the glory of God, and are justified by his grace as a gift, through the redemption that is in Christ Jesus."
The 'but now' (nyni de) is the most dramatic turn in biblical theology. Four key words: (1) dikaiosyne theou — righteousness provided by God; (2) dia pisteos — through faith; (3) dorean — freely; (4) apolytrosis — redemption.
Rom 3:25-26
"Whom God put forward as a propitiation by his blood, to be received by faith. This was to show God's righteousness, because in his divine forbearance he had passed over former sins. It was to show his righteousness at the present time, so that he might be just and the justifier of the one who has faith in Jesus."
Hilasterion — propitiation: Jesus is the new Mercy Seat, where God's wrath is satisfied. The cross solves the theological problem: how can God be just (punishing sin) and justifier (absolving the sinner)? On the cross, God punished sin in Christ.