Count Nikolaus Ludwig von Zinzendorf was without question the most influential German theologian between Luther and Schleiermacher. He was the force behind modern Protestant missions, launched efforts that eventually became the ecumenical movement, and influenced some of the most significant theological projects of the modern world from Schleiermacher's to Barth's and Bonhoeffer's. He was convinced that in important respects the Christian church of his day had lost its way both...