Church Dogmatics, Vol. IV, 3.1: The Doctrine of Reconciliation Karl Barth (T&T Clark)
Barth's work has helped me become more attentive to gospel bridges beyond the church's walls: Jesus—the light of life—penetrates all domains. Moreover, the dissolution of Christendom (e.g., Christian America) makes possible a genuine gospel encounter with those who don't know Christ.
Letters and Papers from Prison Dietrich Bonhoeffer (Touchstone)
Bonhoeffer's reflections from prison opened my eyes to see more clearly that the gospel is not chained, even when we face severe obstacles. God's power will be displayed in the vulnerable witness of Christ and his community, even in an increasingly secular age.
Mere Christianity C. S. Lewis (Macmillan)
Lewis's well-reasoned, no-nonsense, accessible account of the essential Christian faith helps readers come to terms with the fact that the gospel is not about sweet, pietistic niceties. It is about a divine subject who addresses us as the ultimate life-changing reality.
Let Justice Roll Down John Perkins (Regal)
Perkins's autobiography provides a compelling account of the gospel's power to change people's hearts, lives, and communities. His holistic expression of the gospel is an incredible aid in offering the Good News to a broken, fragmented world.
Out of the Salt Shaker & into the World Rebecca Manley Pippert (InterVarsity Press)
Pippert's book is a very practical and useful guide on how to be an effective witness. She assists readers in becoming more natural in their evangelism, more confident in the gospel, and more dependent on God.
Paul Louis Metzger is the author of Connecting Christ: How to Discuss Jesus in a World of Diverse Paths (Thomas Nelson).