The subject of the Holy Spirit has either been neglected or misunderstood, so much so that many avoid it because they fear being charged of schism with labelled as 'spiritists.'
I am convinced that this is the Grand Stratagem of the enemy to push the "Lord of the harvest" off the believers' focus.
It is important to realise that Jesus Christ before death and resurrection spent quality time teaching and instructing the believers on the Person and Ministry of the Holy Spirit.
The effective Christian is a trinitarian believer who holds the Godhead firmly and with all gravity. This is not an exhaustive book on the person of the Holy Spirit but a spark that will inspire interest and a sincere, quality search on that path. It is meant to bring the believer back to the solid foundation of the faith. The bibliography behind may help those who want to explore and understand more.