In chapter 6, Paul explains that grace is not a license to sin, but power to live in newness. The verse summarizes the fate of two masters: sin and God. The wages of sin is death, the payment sin itself produces. In contrast, eternal life is a gift of God, not a wage to be earned. It is not about changing masters, but receiving freedom as a gift. Whoever belongs to Christ lives under grace, which transforms the heart and behavior.