Paul’s letter to the Galatians is a call to stand firm in the freedom to which Christ has called us. The good news of Jesus Christ, which is the message that Paul preached, is that Jesus’s death and resurrection has set us free from the power of sin and death. And the gift of His Spirit is now the means by which we live according to God’s will now. In essence, as followers of Jesus the new creation life He called us to has started now, and we are to live in that freedom by faith.