The Presbyterian Pendulum is a study in mainline Protestant social ethics with a focus on the Presbyterian Church (USA). This book is written for the church with the hope that it will provide theological foundation and spiritual encouragement for our efforts to find unity despite the diversity of convictions and perspectives in our midst. This is a historical study of the significant social and political issues to which the church responded throughout the twentieth century. With a foundation in solid historical research, this book offers the compelling thesis that the Presbyterian Church is at its best when the wild diversity of worldviews, theological perspectives, and convictions are encouraged. Even more, the book offers the spiritually rich thesis that it is in this wild diversity, not despite of it, that the providence of God is seen and known. What is unique and compelling about this study is the guiding metaphor of the pendulum swinging. The vast difference of opinion in the church around social issues has historically always been true, is necessary today, and itself points to a deeper truth about God’s sustaining providence. The church must discern and hold onto that deeper truth. We must let the pendulum swing. It is my hope that this book will be an encouragement for the church even as we continue to be mired in deep conflict.