Our goal as Christians and Christian ministers is never simply to build our own tribe. Instead, we seek the peace and prosperity of the city or community in which we are placed, through a gospel movement led by the Holy Spirit. Movements like these do not follow a 'bounded-set' approach in which you only work with others who can sign off on nearly all your distinctive beliefs and practices. Rather it follows a 'centered-set' orientation in which you work most closely with those who face with you toward the same center. That center is a classic, orthodox understanding of the gospel of Jesus Christ, a common mission to reach and serve your city, and a commitment to have a generous, Christ-focused posture toward people who disagree with you. It's a type of movement that is missional, integrative, and dynamic. This eBook contains the eighth part of Center Church, 'Movement Dynamics.' In it, Keller discusses what it means to faithfully connect the gospel with the culture and the need to develop intentional movements of churches planting new churches that faithfully proclaim God's truth and serve their communities.