Paul warns the Galatians for turning from the one true Gospel to a "non-gospel".

Paul immediately establishes the centrality of the Gospel, to put the conflict with the Judaizers in perspective.

Paul discusses his former life, his salvation by grace alone, and his calling by Christ alone.

Paul emphatically denies that the gospel he has taught the Galations is "his gospel", but rather the true gospel of Jesus Christ.

Paul describes his first confrontation with the leaders of the church in Jerusalem concerning the integrity of the gospel.

Paul's first trip to Jerusalem to talk to Peter and James about his gospel and his apostleship.

Paul confronts Peter when he won't eat with Gentiles in one of the most dramatic and important confrontations in church history.

Paul makes a subtle change in his discussion of salvation by faith. He has been talking about Abraham's relationship with God and how it was based on faith. He now begins to talk about the law and how it is a curse that would condemn everyone if not for Christ.

As Paul continues his discussion of justification through faith, he anticipates the objections of his opponents. In classic Pauline style, he preempts and negates their arguments by stating them in such a ridiculous manner as to prove them false. He closes the passage (and the chapter) by making a profound statement of doctrine-- justification must be by grace alone or Christ's death on the cross was meaningless.

Paul continues his rebuke of Peter and the Jews who were separating themselves from the Gentiles. In doing so, he expresses the core of the Gospel, emphasizing that it is the same for both Jew and Gentile.

Paul continues his discourse concerning justification by faith as opposed to the law, but turns more towards the topic of sanctification. By asking several hypothetical questions, Paul points out the foolishness of the Galatians for listening to the Judaizers. Those justified by faith in the hearing of the Word are not sanctified through the works of the law, but by the same indwelling of the Holy Spirit.