This sermon, from Galatians 2:11–16, emphasizes that the doctrine of justification by faith alone—central to the Reformation and the very heart of the gospel—must be defended with unwavering courage, even against prominent figures like Peter. Drawing on the historical confrontation between Paul and Peter in Antioch, the preacher illustrates how fear of man, even among true believers, can lead to hypocrisy and compromise, undermining the gospel's unity and purity. The message is clear: while Christian love and peace are vital, they must not come at the cost of doctrinal integrity, especially when the gospel itself is at stake. The sermon calls believers to emulate Paul and Luther by standing firm in truth, even when unpopular, recognizing that such stands are not divisive but essential for preserving the gospel's integrity. Ultimately, it affirms that salvation is by grace alone through faith alone in Christ alone, and that any deviation from this truth distorts the very foundation of Christian faith.