I will only say that I understand Paul's writing, correctly, to be saying that we are forgiven of past, present, and future sins (Romans 4:8, Romans 8:38-39, Hebrews 9:12) as believers who are born again.
This means that the relationship to the law has changed as concerning condemnation (Romans 6:14, Romans 7:4, Galatians 2:19, Romans 7:6; Ephesians 2:15-15, Colossians 2:14, Hebrews 7:18-19, Galatians 5:18).
The law doesn't any longer call the believer in Christ a sinner before the eyes of the Father; for He looks down on us and sees the blood and imputed righteousness of His Son Jesus Christ. The believer is declared righteous before God on the basis of his faith (and not his works)...therefore when he comes in contact with the law, there is no condemnation.
That being said, if anyone is truly born again (regenerated and renewed in the Holy Ghost), he is not the same person that he used to be.
Tit 3:3, For we ourselves also were sometimes foolish, disobedient, deceived, serving divers lusts and pleasures, living in malice and envy, hateful, and hating one another.
Tit 3:4, But after that the kindness and love of God our Saviour toward man appeared,
Tit 3:5, Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;
Tit 3:6, Which he shed on us abundantly through Jesus Christ our Saviour;
Tit 3:7, That being justified by his grace, we should be made heirs according to the hope of eternal life.
He or she is obedient as a child of God.
This means that the motivation for obedience is no longer fear, as though the law were an unforgiving taskmaster (as it is to those who are not in Christ); but the motivation now is love, as the person has been given a new heart and a new spirit and therefore the Lord causes him or her to walk in His statutes and in His judgments (Ezekiel 36:25-27).
We obey God because we are born again and our nature has been changed on the inside so that we delight in obeying God.
It is no longer because of any condemnation that might fall on us for disobedience.
As the result, if we should fail or blow it and fall back into sin, there is grace from the Lord to cover over our sin (Romans 4:7-8).
The fact of the matter is, we have been given a new, unshakable identity...that we are righteous....because of our faith...we continue to have this identity even if we should blow it at some point (Romans 4:5).
The exhoration therefore now is, go and live like your identity (1 John 3:7, Romans 5:19, Matthew 5:6).
There is no condemnation for those who fail for as long as they continue to have faith in Jesus (John 6:47).
Of course, faith can be affected by sin (Hebrews 3:7-15); so it is important for us to restore relationship when we sin by confessing our sins unto sanctification (1 John 1:7-9).