In the 1st chapter of Revelation John says that he was in the spirit. He was still himself as a unique identity and yet was experiencing another realm of his being that was beyond the physical limitations of his Flesh on the Earth. And yet he functions as a being with a body saying he turned around to see the voice that was speaking to him.
He saw the lampstand in the heavenly Temple which is located inside the Holy Place and also one like a son of man, A being in the general image and form of a man of the Earth and yet with supernatural features like eyes of fire, glowing feet and other things described in chapter 1 versus 14 - 16 Showing that He was a Holy Spiritual being.
This Holy Spirit speaks to him and describes himself in unmistakable terms as being Jesus.(chapter 1:17-18).
In verse 20 shows what is involved in His priestly ministry
The Holy Spirit then goes into further explanations and details in the next 3 chapters describing to each church that He is the Holy Spirit and He also describes Himself in no uncertain terms as Jesus.
The Holy Spirit is the Spirit of Jesus and it shows how he is operating in the time before the end of days. In somewhat like manner that John was in the spirit, the Holy Spirit is operating from the Holy Place of the Heavenly Temple and ministering through counselling, wisdom, knowledge and all the other of the 7 Spirits of God that are found around the Throne and directed to the believers that make up the churches on Earth
Any thoughts, ideas, or insights welcome to help in the goal of complete truth. Next I think it would be interesting to look at what is revealed about the Father or any other examples about the Holy Spirit