St. Gregory of Nazianzus provides an ancient perspective of the theological explanation for the relationship of Jesus Christ and the Holy Spirit to the Oneness of God as taught in the Old Testament. Modern writers like Gordon Fee in his book Paul, the Spirit, and the People of God suggests that the Apostle Paul was less interested in theology than he was the practical implications of God as Trinity.
Do you think one of these perspectives is more truthful or accurate than the other? If so, why or why not?
(If you are not familiar with St. Gregory's or Fee's work, how about the ancient vs. the modern view of the Oneness of God)