One True Church?
 
I. What Is the Unity of the Church?
1. The unity of Father or Son or Holy Spirit (1 Cor. 12:12-13, Gal. 3:28)
Abuse: Unitarian homogeneity/totalitarianism
2. The unity of Father and Son and Holy Spirit (John 17:20-23)
Abuse: Tritheistic pluralism/anarchy
Either way, the Church's unity is God's unity, a divine gift and reflection
 
II. How Is Unity Mediated?
1. By communion with the apostles' successors
(Catholics: and ultimately the Bishop of Rome)
Effect: Unity is institutional
2. By obedience to Scripture
Effect: Unity is "invisible," doctrinal
Effect: Confessions and statements of faith proliferate
3. By the presence of God through the Holy Spirit
Effect: Spiritual gifts are the only final evidence
Effect: Unity is spiritual or ethical
 
III. All of the Above?
Lesslie Newbigin: These types are each insufficient
Bishops, Word, sacraments are media of the Holy Spirit
The Holy Spirit's action takes concrete forms (implying Holy Tradition)
Christ always has two mediators: Holy Spirit and Church
Disunity compromises the Church's witness, injures the body of Christ
"The Church's One Foundation"