Dr. Rodman Williams in his book “A Theological Pilgrimage” writes:
Here there are a wide variety of testimonies – and in large part this is due to the fact that we are talking about the Holy Spirit. To try to track the Spirit is a little like tracking the wind; it is indeed hard to accomplish! “The pneuma blows where it wills….” There is about the Spirit an unpredictability, a freedom that makes suspect any claim that “this is exactly the way it always happens,” etc. The Spirit has a way of moving not according to our plans and schemes but according to His own sovereign intention. So the dynamic movement of the Spirit cannot be charted but occurs in an unlimited number of ways and situations. Blueprints are out!
Do you think based on what he is saying that it is possible for a Theologian to develop a complete Systematic Theology on the Holy Spirit?