When we are at risk of losing something that really matters to us we can react in a bold and aggressive manner? What if it is the most important thing in the entire universe? Paul would say the most important thing ever is the gospel of Jesus Christ. He reacts boldly to counter the very real threat of some who were trying to add to the gospel. When we add to the gospel we take away from power it can have in our lives to transform us into the image of Jesus. The gospel is Jesus and never Jesus +.