"But suppose we seek to be made right with God though faith in Christ and then we are found guilty because we have abandoned the law. Would that mean Christ has led us into sin? Absolutely not! Rather, I am a sinner if I rebuild the old system of law I already tore down. For when I tried to keep the law, it condemned me. So I died to the law - I stopped trying to meet all its requirements - so that I might live for God. My old self has been crucified with Christ. It is no longer I who live, but Christ lives in me. So I live in this earthly body by trusting in the Son of God, who loved me and gave himself for me. I do not treat the grace of God as meaningless. For if keeping the law could make us right with God, then there was no need for Christ to die." (Galatians 2:17-21 NLT)
Maybe this might help, if anyone might feel as though this doesn't make any sense. As the Bible has clearly shown us, there is nobody that is without sin! We all sin; some more than others! But God, who made everything, with the intension to make us holy, even though could never be holy on our own; has made the way for us to be perfectly holy: as white as snow!
This is really not something that we easily believe; most of us still feel guilt and shame for the things we have done; which is constantly something we think about, even though we believe that God has forgiven us. The hardest part in our journey, is to be able to forgive ourselves! Much like Paul, we are most likely always going to remember some of those things we have done; but that does not make us unable to believe that we have been forgiven; as a matter of fact, it keeps reminding us of God's great and powerful love and grace...
""For God loved the world so much that he gave his one and only Son, so that everyone who believes in him will not perish but have eternal life. God sent his Son into the world not to judge the world, but to save the world through him. "There is no judgment against anyone who believes in him. But anyone who does not believe in him has already been judged for not believing in God's one and only Son. And the judgment is based on this fact: God's light came into the world, but people loved the darkness more than the light, for their actions were evil. All who do evil hate the light and refuse to go near it for fear their sins will be exposed. But those who do what is right come to the light so others can see that they are doing what God wants."" (John 3:16-21 NLT)