Instead of opening this letter to the Galatian churches with a thanksgiving for them — as Paul normally does — he begins by stating that he is astonished that they are so quickly deserting Jesus. The Galatians didn’t think that they had deserted Jesus! But Paul labors for Christ formed in them through the book of Galatians by demonstrating that departing from true gospel doctrine is deserting Jesus himself. In these first handful of verses, Paul sets out the terms of true gospel doctrine.