"For it is the presence, power, life and character of God and His Son"
HOLY SPIRIT IS PRESENCE OF GOD AND SON
Psalms 51:11 "Cast me not away from thy PRESENCE; and take not thy holy spirit from me."
Psalms 139:7 "Whither shall I go from thy spirit? or whither shall I flee from thy PRESENCE?"
Romans 8:9-11 "But ye are not in the flesh, but in the Spirit, if so be that the SPIRIT OF GOD DWELL IN YOU. Now if any man have not the SPIRIT OF CHRIST, he is none of his. And if CHRIST BE IN YOU, the body [is] dead because of sin; but the SPIRIT IS LIFE because of righteousness. But if the SPIRIT OF HIM (GOD) that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by HIS SPIRIT that dwelleth in you."
By the Spirit (their presence) is Jesus and God the Father abiding in us. But there is no mention of a third being abiding in us! The Spirit (power, mind, presence) of God is not limited to being stuck with Him. Paul says in 1 Cor. 2:11 "For what man knoweth the things of a man, save the SPIRIT OF MAN WHICH IS IN HIM? EVEN SO the things of God knoweth no man, but the SPIRIT OF GOD."<- (no mention of it being limited to being only in GOD) But Paul makes a parallel comparison of both by saying "EVEN SO" or "just like". Paul can make this comparison because he knows that we are made in the image of God.
HOLY SPIRIT IS POWER OF GOD AND SON
Luke 4:14 "And Jesus returned in the POWER OF THE SPIRIT into Galilee: and there went out a fame of him through all the region round about."
Romans 15:19 "Through mighty signs and wonders, by the POWER OF THE SPIRIT OF GOD; so that from Jerusalem, and round about unto Illyricum, I have fully preached the gospel of Christ."