Be on guard for yourselves and for all the flock, among which the Holy Spirit has made you overseers, to shepherd the church of God which He purchased with His own blood. (NASB)
It did not take long for the early Christians to start to qualify (or quantify) the relationship between the Father and the Son, not to mention what role if any the Holy Spirit played in this family of sorts.
Yesterday, while discussing the Book of Acts with my Sunday School class, I read this as a measure of the author’s (not Paul’s) Christological stance. The developing Trinitarian motif of the verse stood out in stark contrast to Paul’s subordinationism.
Here, all three Persons play a role in the Church.
The Church belongs to God (the Father, as indicated by the relationship to the spilt blood), but is governed by the Spirit. The blood (of the Son) is what secured the Church. Throughout Paul’s speech in Acts 20.17-29, the role of the Spirit is heightened much more so than it is in the Pauline Corpus, making it parallel to the role of the Spirit in the life of the Church in Ephesians. Further, the speech begins with a salutation to Jesus but ends with a commendation to God the Father.
Unless, of course, you believe God has blood and can die?