Galatians 4 shows that both legalism and idolatry are forms of spiritual slavery that reject the freedom found in Christ. Paul uses the image of a child-heir under a guardian to illustrate that, before faith, people are enslaved to “elementary principles”—whether the Jewish law or pagan gods. But when Christ came, he redeemed us, adopted us, and sent his Spirit into our hearts so that we cry “Abba, Father.” Christians are not slaves but sons, and we are called to live out that sonship through knowing the truth, praying as children to our Father, and serving others in love—rejecting anything that would pull us back into trying to earn what has already been freely given.

Justification with God comes not by law-keeping or moral performance but by faith alone in Jesus Christ. Paul shows that all who rely on works are under a curse because no one perfectly keeps God's law. But God gave Abraham righteousness through faith before the law or circumcision, and that same blessing—peace with God and his abiding presence—is extended to Jew and Gentile alike. Christ redeems sinners from the curse by becoming a curse for them, bearing God’s wrath on the cross so that they might receive the promised Spirit through faith and become true children of Abraham.

Paul confronts Peter for acting in a way that misrepresents the gospel, reminding us that justification is by faith in Christ alone—not by works or law-keeping. When we misuse God’s law as a means of righteousness, we not only mislead others but also obscure the good news of grace. The law functions like a mirror, showing our need for Christ, while only Christ can make us righteous. Justification is a gift received, not earned or maintained through human effort.