500 years ago Europe was set ablaze with a single idea—humans are justified before God by faith alone. Some wonder how this principle—that ignited the Reformation and for which countless Europeans would give their lives—is still relevant today. And besides, don’t we understand the message Luther was promoting? Yet the anxiety that plagued Luther and his contemporaries is as pervasive in our own day as it was in his. Could it be that we have failed to grasp the message that captivated Luther? And could a rediscovery of Justification by faith have just as much relevance today as it did 500 years ago?