Paul defends the unity of the church by emphasizing the covenant God made with Abraham and reminding the Galatians that the promise God made was fulfilled in Jesus and all can access it by faith. Paul argues that the Galatians received the Spirit through faith, not works, and quotes scripture saying Abraham believed God and it was counted to him as righteousness. Paul uses an analogy that a covenant cannot be altered or added to, and that the promises were made to Abraham and his family, meaning Christ. Paul concludes that all who are baptized into Christ are one, regardless of social or ethnic barriers, and belong to Abraham's family through faith in Christ.