Isaiah: 1 The vision of Isaiah the son of Amoz (etc)”
Having a vision is a part of being a human and a part of having a special relationship with God. So, Isaiah may indeed be a real person; a prophet. However, one may ask: who was introducing the book to the reader? Who was the true author of verse 1? This author clearly didn’t belong to the same historical period as Isaiah because of the way s/he referred to that “in the days of Uzziah, Jothan, Ahaz, and Hezekiah, kings of Judah”. How did this author find the book of Isaiah? Was it a written manuscript s/he found or was it a verbal narration? And if it is the latter; who had narrated the whole book to the writer perhaps hundred years after the events that took place in the book? Was the narrator the same as the one who narrated the book of Genesis to Moses?
Isaiah the channel of the voice of God
The speaker in verse 2 is Isaiah.
Two synonyms have been used to highlight the requested action: TO HEAR
The intended audience: heaven and earth.
Has spoken: The action of speaking of the Lord is something of significance. This is translated in the use of perfect tense, in English and in the present progressive in Arabic.
Isaiah is rendering himself a broadcaster of God’s message and a channel through which God speaks. This means that halfway through verse 2, God starts speaking directly.