The Protestant Reformation of the sixteenth century was one of the great moments in history when the church recovered the heart of the gospel: that we are saved by grace alone, through faith alone, in Christ alone, revealed in Scripture alone, to the glory of God alone. That move of the Spirit and the revival of the gospel are needed as much today as they were then. This study explores the life-giving truths that fueled the Reformation and continue to bring freedom, assurance, and joy to believers today.