The book of Romans is a letter from Paul to the Romans, in which he explains that the Gospel is the power of God for salvation, and that humanity's rejection of God has led to moral depravity and sinful behaviors. Paul argues that true righteousness comes from inward obedience to God's will, and that all people, Jews and Greeks, are under sin and have fallen short of God's standards. However, God's justice has been made manifest through faith in Jesus Christ, and believers have access to God's grace and stand firm in the hope of eternal life. Paul urges believers to offer their bodies as living sacrifices to God, to be transformed by the renewal of their minds, and to live in harmony with one another.