The Gospel of John 17:20-21

In Your Church Is Too Small, John Armstrong presents a vision of the unity possible for Christians across social, cultural, racial, and denominational lines. When Jesus’ followers seek unity through participation in the kingdom of God and the mission of Christ, they demonstrate God’s character to a watching world.

“I pray also for those who will believe in me through their message, that all of them may be one, Father, just as you are in me and I am in you.” Too often, these words of Jesus from John 17:20-21 seem like an unreachable ideal. But in Your Church Is Too Small, John Armstrong shows that Jesus’ vision of Christian unity is for all God’s people across social, cultural, racial, and denominational lines.

Dr. John H. Armstrong is the president and founder of ACT3 a mission committed to equipping leaders for unity in Christ’s mission since 1991. For twenty years he served as a pastor, the last sixteen in Wheaton, IL. John is the author/general editor of twelve books.  He also serves as an adjunct professor of evangelism and leadership at the Wheaton College Graduate School. He is a prolific writer and regular blogger.  He attended the University of Alabama, is a graduate of Wheaton College (B.A., M.A.) and Luther Rice Seminary (D.Min.) and an ordained minister in the Reformed Church in America. John has been married to his best friend, Anita, since 1970 and is the father of two married children (Matthew and Stacy) and the grandfather of two girls (Gracie and Abbie).

“John Armstrong has spent his entire ministry working to build the Church, and he has sometimes paid a dear price for insisting that true believers in every communion must work together to re-assert the unity of Christ's Body. This book is John's story and manifesto for the much-needed work of building bridges, forging alliances, and renewing oneness across all the various expressions of the Church of our Lord Jesus Christ. It's a must for anyone who has grown weary with Christian divisiveness and schism and longs to discover ways of strengthening the bonds that unite us in the Spirit of Christ.”

— Chuck Colson,
founder of Prison Fellowship Ministries
and 1993 winner of the Templeton Prize



“John Armstrong is one of those Evangelical theologians who know that full obedience to Christ embraces the historical transmission through which we know him. This book refuses to scale down the bearer of that tradition—the historical church, that is—or reduce the authority of its voice.”

— Fr. Patrick Henry Reardon, senior editor, Touchstone

“If the late Lesslie Newbigin could offer today’s church an exhortation—a reminder from the past, an assessment of the present, and encouragement for the future—what would the old bishop say? In what he terms ‘missional ecumenism,’ John Armstrong proposes an answer that confronts readers with the universal shape of Christian identity.”

— Chris Castaldo, author of Holy Ground: Walking with Jesus as a Former Catholic

“With attention to his own pilgrimage and growth in ecclesial awareness, John Armstrong explores here the evangelical heart and ecumenical breadth of churchly Christianity. I am encouraged by his explorations and commend this study to all believers who pray and labor for the unity for which our Savior prayed.”

Timothy George, founding dean, Beeson Divinity School of Samford University; and senior editor, Christianity Today