According to our Lord Jesus it is expedient that He goes away (back to heaven) because He said if He does not the Holy Spirit or the Comforter will not come to us. We know from the Scriptures that the Holy Spirit came and empowered the early believers.
I believe we still have the Holy Spirit today but it seems He remains a mystery to most of us. I believe the Holy Spirit is not confined to one or few Christian denominations but He is where He desires to be. He resides in true believers.
When He is in us we will call Jesus is our Lord or Jesus is Lord. He directs, He reveals, He gives gifts. He is gentle and He can be grieved. He is the Spirit of Truth. The Bible said He will not speak of Himself but whatever He hears from the Father and the Son He will speak or reveal to us.
I believe He deals with us individually and as a group or as a church.
He showed me i need to grow up more and obey more after listening more. That i need to wait more. Again He is gentle.