The Holy Spirit is wanting to SPREAD into the various parts of a person's soul. The soul of man is composed of different parts like his mind, his emotion, and his will.
These parts are aside from the central kernel and nucleus of a man's innermost being. His innermost being is called his spirit. And in regeneration his reborn human spirit becomes united with the Holy Spirit to be "one spirit"
" He who is joined to the Lord is one spirit" ( 1 Cor. 6:17)
Now God's intention is that the indwelling Holy Spirit migrate out from that kernel of a man's being into all the part his soul. So on one hand the believer has the Holy Spirit forever. Yet on the other hand he needs the life long process of the Spirit moving out into his personality.
Now consider the "rivers [plural] of living water"
which mean the Holy Spirit in John 7:39
" Now in the last day, the great day of the feast, Jesus stood and cried out, saying,
If anyone thirst, let him come unto Me and drink. He who believes into Me, as the Scripture said, out of his innermost being shall flow rivers of living water.
But this He said concerning the Spirit, whom those who believed into Him were about to receive; for the Spirit was not yet, because Jesus had not yet been glorified." (vs 37-39)
RIVERS [plural] of living water mean different streams into the different parts of the man's soul from his innermost being. In other words the ONE Holy Spirit joining to the human spirit in the new birth seeks to flow out as many "rivers"
to the various parts of the man's personality.
There is a river flowing into his emotions.
There is a river flowing into his memory.
There is a river flowing into his imagination.
The Lord seeks to cause the Holy Spirit to flow out from his kernel, his innermost central being into the various chambers of his soul. He has a river for the will. He has a river for the mind. He has a river for the will.
So when Rajk999 complains that some Christian is without the Holy Spirit, the New Testament teaching is that part of his soul still awaits the dispensing of one of the rivers of the Holy Spirit into some chamber of his personality.
This requires experience to understand and not just a analytical mind of bible knowledge.
The Spirit is imparted into the kernel of a man. And the Spirit ever seeks to transform him by flowing various streams of influence into the various chambers of the man's soul.
In this same way Jesus told the woman that the Spirit would be a fountain installed in her being which would gush up into eternal life. That means to gush up out of her innermost being into all the parts of her soul and eventually even bring indestructibility to her physical body.
" But whoever drinks of the water that I will give him shall by no means thirst forever, but the water that I will give him will become in him a fountain of water gushing up into eternal life." (John 4:14)
The gushing up of the installed fountain and the flowing out of many rivers of water mean the same thing. The Holy Spirit implanted into the central spiritual being of the saved person seeks to move out and saturate their entire soul and personality.