Paul's apostolic proclamation of "one Lord Jesus Christ" in 1 Corinthians lies at the very heart of Christian belief. It forms the starting point of the Christological declaration in the Nicene Creed and is the basis of every subsequent statement of the church on the person and work of Jesus. In Ecce Homo Aaron Riches argues that this basic proclamation of Christ's divine unity is the only legitimate starting point for Christology.
Interacting with theologians throughout the ages, Riches narrates the development of the church's doctrine of Christ as an increasingly profound realisation that the depth of the difference between humans and God is realised only in perfect union with God. He sets the apostolic proclamation in its historical, theological, and mystical context, showing that it ultimately surpasses every theological attempt to divide or reduce the "one Lord Jesus Christ."