How do we know that Christians are no longer servants of sin?

Romans 6:17-18 states, 'But God be thanked that you were the servants of sin; but you have obeyed from the heart that form of doctrine which was delivered unto you. Being then made free from sin, you became the servants of righteousness.' This passage illustrates the transformation that occurs in believers. Initially, they were bound to sin; however, through obedience to the gospel, they receive a new heart and nature. This change empowers them to serve righteousness instead of sin, affirming that genuine faith leads to life-altering obedience. The doctrine of sovereign grace reinforces that this transformation is solely attributable to God's grace, not human effort.