Is the Gospel Enough?

Art Morris teaches on Galatians, chapter 1. Topics mentioned included:

• The nature of authority
• That there was active opposition to the gospel in that day and we face active opposition now
• The story of Paul's life was different after conversion. How is your story different

One of the themes of the book might be the question: "Is the gospel enough?". For the churches that Paul was addressing, there was the problem of adding Jewish custom. What is it that we try to add? What keeps us from believing that the gospel is enough for us?