If one has been justified, their life should be characterized by humility and love (Romans 12:3–21). One should fulfill his role in the body of Christ and not think too highly of himself (12:3–8). The main characteristic of a believer should be the love he has for others (12:9–21). A believer should submit to the authority that God places in charge, even if the authorities are unbelieving (13:1–14). Also, in the area of Christian liberty, one must be humble and not judge other believers. Out of love for the weaker brother, one should relinquish his own “rights”, bring glory to God, and not cause his brother to stumble (14:1–15:13)
Sanctification is the process of living a holy life (6:1–14). Once one is justified, he is now dead to sin (6:1–2). He needs to realize that he is a new creation (6:3–10). His desire to live in his old ways should be gone, and he should consider himself dead to sin (6:11). Absolutely, one must present his body to God as an instrument of righteousness (6:12–14). There should be a contrast between one’s new life and his old life, since he has a new Master to serve (6:17–23).
There is a future glorification that a believer is guaranteed, and the present sufferings are not worthy to be compared to it (8:18). All of creation, including believers, groans because it is awaiting the future glorification of God’s children (8:19–25). Even the Holy Spirit groans and intercedes for the believer (8:26–27). Since God is in complete control, the believer has the assurance that God’s plan can not ever be interfered with. Even if the believer has to go through suffering, it is part of God’s plan to bring glory to himself (8:28–30). The one who is justified can not ever be separated from God, because no one can bring a charge against God’s elect. (8:31–39).