Our new covenant righteousness comes by faith and not works.
If you are righteous by your deeds, you don’t need faith. You also don’t need faith to know that you are sinful. But you need faith to believe and declare that you are the righteousness of God in Christ, in the midst of your struggles with temptation and sin.
The devil may remind you of your foul temper and question your integrity: “How dare you call yourself righteous when you just did that!” Just ignore his lies and boldly declare, “I am not righteous because of what I have done or not done. I am righteous only because of the blood and finished work of Jesus at the cross!”
But to him who does not work but believes on Him who justifies the ungodly, his faith is accounted for righteousness,Romans 4:5