Paul delivers a clear and concise definition of the gospel in the opening verses of 1 Corinthians 15. In Galatians, Paul fiercely defends the gospel against distortions of legalism and antinomianism. We see the beauty of the battle cry of the Protestant Reformation come alive in Galatians, as Paul reminds his readers then and today of the beauties of salvation that is by grace alone, through faith alone, in Christ alone, according to the Scriptures alone, for the glory of God alone.