We can have confidence in our relationship with God if we believe in the sacrifice of His Son. We have no need for more sacrifices since Christ has become the one and only sacrifice forever. Christ’s sacrifice is a free gift meaning we don’t need to do anything on our own power but simply except His loving sacrifice.
God has perfected everyone who believes in Him so when we fall we must not think that God will not except us. He has given us His law so that we can live according to His will. If we do this He says that He remembers our sins no more.