"A Treatise on Good Works" by Martin Luther allows readers to get to know the theologian and religious thinker whose radical reinvention of the Christian faith sparked the Protestant Reformation. In A Treatise on Good Works, Martin Luther expounds on his contention that although Christlike behavior is important, believers are redeemed ultimately through God's grace. Martin Luther was a German monk, Catholic priest, professor of theology and seminal figure of the 16th-century movement in Christianity known later as the Protestant Reformation.