In the "God head", Jesus, as Jesus, didn't speak in the OT, he was known as the Angels of God/Lord", his name was a "Secret", Jews still refer to him as "Hashem" or "the name".
The "Comforter" was sent "in my name", Jesus, the Holy "GHOST" is the "Ghost of Jesus" speaking.
Joh 14:26 But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things,
Joh 10:27 My sheep hear my voice,
Israel rejected God speaking directly to them at Mt Sinai,
Ex 20:19 And they said unto Moses, Speak thou with us, and we will hear: but let not God speak with us, lest we die.
Heb 1:1 God, spake in time past unto the fathers by the prophets,
And again when they rejected God speaking directly to them through Jesus.
Heb 1:2 Hath in these last days spoken unto us by his Son,
This "comforter" is the only thing in the world that is "Greater than Satan".
1Jo 4:4 because greater is he that is in you, than he that is in the world.
1Co 6:19 What? know ye not that your body is the temple of the Holy Ghost which is in you,
2Co 13:5 Know ye not your own selves, how that Jesus Christ is in you,
And being made "members" of the "body of Christ", Satan can't have "power/dominion" over "Christ's Body".
1Co 6:15 Know ye not that your bodies are the members of Christ?
1Co 12:27 Now ye are the body of Christ, and members in particular.
Ro 6:14 For sin (or Satan) shall not have dominion over you:
The Comforter arrived on the day of "pentecost" and the "Last trump" of the voice of Jesus will call the dead from their graves, change the living, and take them to where he is, Heaven, for the "lamb's Marriage supper".
God will go back to speaking by "prophets" (two witnesses) to Israel during the trib.
The "Trinity" explains scripture as well as the "God head".