“If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness.” (1 John 1:9)
Everyone falls short and sins
The Bible makes it clear that no matter how hard we may try, we fall short of God’s righteous standard of perfection. “Surely there is no righteous man on earth who does good and never sins.” (Eccles. 7:20)
There’s good news — God’s grace freely makes us right
“For everyone has sinned; we all fall short of God’s glorious standard. Yet God, in his grace, freely makes us right in his sight. He did this through Christ Jesus when he freed us from the penalty for our sins. For God presented Jesus as the sacrifice for sin. People are made right with God when they believe that Jesus sacrificed his life, shedding his blood. This sacrifice shows that God was being fair when he held back and did not punish those who sinned in times past, for he was looking ahead and including them in what he would do in this present time. God did this to demonstrate his righteousness, for he himself is fair and just, and he makes sinners right in his sight when they believe in Jesus.” (Rom. 3:23-26 NLT)
Therefore
“Wash me thoroughly from my iniquity And cleanse me from my sin.” (Psalm 51:2)
“Create in me a clean heart, O God,
And renew a steadfast spirit within me.” (Psalm 51:10)