At the end of chapter 5, Paul contrasts Adams sin with Christ's justification showing how grace abounds in justification. God's grace is more powerful than the reign of sin and death (Rom 5:20). A believer is freed from his bondage and God's own righteousness is imputed to him. God's grace overshadows sin and gives way to a faulty logic which takes advantage of God's goodness.
ABUSE OF GOD"S DIVINE GRACE.
Sanctification begins by putting our faith and trust in Jesus as our personal Savior. The idea of grace always abounding sin presents a possible loop hole to sanctification. Grace will always cover sin no matter how far we allow ourselves to sin. Sin of a believer reverses or nullifies the sanctification process. There are three stages of sanctification: Initial, continuing, and ultimate. Initial is when God saves a believer. This believer is set apart for God's glory. Continuing or progressive sanctification is when God presently works in a believer's life to keep him apart for His glory. Ultimate sanctification happens when God calls us home to be with Christ forever.
Paul recognized God's grace could be interpreted as a carte blanche to sin. If God's grace will abound over sin (Rom 5:20) then certainly man could try and manipulate this truth for his own selfish desire. They could take the attitude, since the blood of Christ paid for all sin and the grace of God is limitless, we are free to sin! They may suggest bringing more glory to God by doing more evil. Kent Hughes in his commentary on Romans 6 mentioned Rasputin, the Russian monk who heavily influenced the Romanov family in their final years. Hughes wrote "He (Rasputin) argued that because those who sin more require more forgiveness, those who sin with abandon will as they repent experience greater joy; therefore, it is the believer's duty to sin." This attitude or philosophy abhors righteousness. There are those who think they don't have to worry about sin because it's God's job to forgive.