Prayer is one of the central activities of the Christian life. This anniversary edition of Karl Barth’s lectures on the Lord’s Prayer, along with supplementary essays by three Barth scholars, introduces us to what Barth had to say about this important Christian practice. For Barth, the ultimate aim of all theology is worship, and here he mines the theological and spiritual wisdom of Luther, Calvin, and the Heidelberg Catechism and urges us to participate in the work of God through prayer. Karl Barth was one of the major theologians of the twentieth century. He is remembered for his voluminous theological writings, especially his Church Dogmatics.