John Franke’s Missional Theology: An Introduction starts with the idea associated with Karl Barth and the missiologist Karl Hartenstein that the biblical God is in his very nature a missional God. Mission is not primarily what the church does; it is what God does, expressed most fully in the life, death, and resurrection of Jesus Christ. Through the Spirit the church participates in the missio Dei—the “mission of God”—as its social, historical, and cultural embodiment, and is fundamentally defined by that participation. The church is not missional in one or other of its activities—doing evangelism, planting churches. It is missional at its core and in its entire purpose.