Called 'The most influential interpreter of American religion' by Bill Moyers, renowned historian and Lutheran pastor Martin Marty portrays the religious reformer Martin Luther as a man of conscience and courage who risked death to ignite the historic reformation of the Church. Luther's arguments, including his '95 theses,' changed the destiny of Christendom, the shape of Christianity, and gave rise to new freedoms in church and state. Marty explores the records left by Luther of his inner struggles and his conflicts with the Holy Roman Empire to find a man engaged in a lifelong passionate search for not only the grace of God, but also for the assurance that it was directed toward each individual.