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.

In Galatians 3:1–6, Paul confronts the Galatians for drifting from the gospel of grace, reminding them that they received the Spirit not by works but by “hearing with faith.” This sermon emphasizes that the Christian life—both its beginning and its continuation—is entirely dependent on God’s grace, received through faith. Good works are not the cause of salvation, but the result of it. Christians must resist the temptation to rely on self-effort and instead daily return to the gospel, trusting in the Spirit’s power for sanctification.

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.