The apostle Paul opens this letter immediately defending the gospel message that he proclaimed. He summarizes the gospel message a couple times in the salutation. Rather than opening his letter with a section of thanksgiving, Paul declares his astonishment that these Galatian churches are deserting the Lord by leaving the grace of God and turning to another gospel, which is not a gospel at all. Paul is so concerned about what these Christians have left that he warns them that if anyone, human being or spiritual being, comes to them declaring a different message than what Paul proclaimed, then let that person be accursed.
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