Book excerpt: Renowned biblical scholar Thomas Schreiner looks at the historical and biblical roots of the doctrine of justification and offers an updated defense of this pillar of Reformed theology. Reinvigorating one of the five great declarations of the Reformation—sola fide—Schreiner: Summarizes the history of the doctrine, looking at the early church and the writings of several of the Reformers. Walks readers through an examination of the key biblical texts in the Old and New Testament that support the Reformed understanding of justification. Discusses whether justification is transformative or forensic and introduces readers to some of the contemporary challenges to the Reformation teaching of sola fide, with particular attention to the new perspective on Paul. Five hundred years after the Reformation, the doctrine of justification by faith alone still needs to be understood and proclaimed. In Faith Alone you will learn how the rallying cry of “sola fide” is rooted in the Scriptures and how to understand this doctrine in a fresh way. —THE FIVE SOLAS— Historians and theologians have long recognized that at the heart of the sixteenth-century Protestant Reformation were five declarations, often referred to as the "solas." These five statements summarize much of what the Reformation was about, and they distinguish Protestantism from other expressions of the Christian faith: that they place ultimate and final authority in the Scriptures, acknowledge the work of Christ alone as sufficient for redemption, recognize that salvation is by grace alone through faith alone, and seek to do all things for God’s glory. The Five Solas Series is more than a simple rehashing of these statements, but instead expounds upon the biblical reasoning behind them, leading to a more profound theological vision of our lives and callings as Christians and churches.