Once more I write personal observations.
The Ethiopian was riding in a carriage/chariot; he possessed a Hebrew scroll; he was able to read Greek. (Given the description of him, it is reasonable to assume he could also write in some language.) He was reading the Isaiah scroll after going to worship at Jerusalem. (Since he was not aware of Jesus, I assume he was a Jew.) These are in line with the description that he was a person of high position and learning.
To me, the key point being addressed by the writer is at verse 34: "Tell me, please, who is the prophet talking about, himself or someone else?" (NIV)
The Christians were attempting to convince Jews that their own Scriptures predicted this person Jesus/Yeshua, and this story at Acts was a vehicle employed as part of the Christians' strategy. In this case, the Christians were trying to reapply Isa 53:7, 8 to their dead leader, while the Jews were telling them it was referring to the time of Isaiah (the Jews were correct, of course).
The rest of the story, such as the Spirit angel having a chat with Philip, are padding which was added to give authenticity to the story.
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While thinking about this black man I was reminded about my beef that the artists of the Middle Ages and those employed by the WTS show the faces of Jesus, his disciples, the early church, and others as pale-faced Europeans/Americans. Sure they place loose cloths garbed around the heads and bodies of their subjects, but the artists clearly make the vasiages unmistakeably Occidental.
Those people are of the Middle East, darker, swarthy, wrinkled by the sun and the sand. They are not namby pamby people from the courts of Italy or from the health studios of Western culture.
Just thinking aloud.
Doug