Romans 3;21But now a righteousness from God, apart from law, has been made known, to which the Law and the Prophets testify. 22This righteousness from God comes through faith in Jesus Christ to all who believe. There is no difference, 23for all have sinned and fall short of the glory of God, 24and are justified freely by his grace through the redemption that came by Christ Jesus. 25God presented him as a sacrifice of atonement,i through faith in his blood. He did this to demonstrate his justice,
Ephesians 2:8For it is by grace you have been saved, through faith—and this not from yourselves, it is the gift of God— 9not by works, so that no one can boast. 10For we are God’s workmanship, created in Christ Jesus to do good works, which God prepared in advance for us to do.
We will discuss Rom 3:21 when you can conceed that the primary meaning of δικαιουσυνη is "justice" (see BDAG, #1), and that of νομος is "norm" (see BDAG #1).