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Life can be a series of small decisions, open doors and closed ones, that lead to big changes. Before Martin Luther, the Church had devolved into a bureaucracy of popes, bishops and councils. Luther challenged that structure and renewed Christ's message of grace without works. The result was the Protestant reformation and a reframed view of faith. In this series, Horizon explores the life of the man, and those that followed, whose courageous steps changed the world.