But let us take a more analytical look at a few things, with regard to how the Holy Spirit acts within a reborn heart:

"This Spirit co-testifies together with your spirit, that you are children of God... and the Spirit co-perceives your weakness.  As to what we should pray for - the way we should - we do not know; but that Spirit beseeches on our behalf, with mute sighs.  The One Who examines the hearts knows what the thought of the Spirit is - that it beseeches to God on behalf of saints."  [Romans 8:16, 26,27]

"...for the Spirit of the truth...is within you... as for the Paraclete (Consoler), the Holy Spirit... He will teach you everything, and will remind you of everything that I had told you... will lead you to all the truth... everything that He hears He will speak of, and will announce to you what is to come... He will glorify Me..."  [John 14:17,26 - 16:13-14]

"...God, Who is also the One who has sealed you and Who has given you the betrothal ring of the Spirit in your hearts..." [2 Corinthians 1:21, 22]

The Apostles Paul and John inform us in the above verses that the place where the Holy Spirit functions is the heart, and that in there, apart from co-testifying to the Christian's adoption, the Holy Spirit - as the Paraclete (the Comforter) - also inspires Christians to pray, and teaches to their spirits.