>> “I’m pretty sure Paul spoke at least a little Greek, based on Acts 21:37 account of when he was jailed toward the end, and him having somewhat astonished one of the Roman soldiers that he was able to speak Greek.” <<
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Yes, but Paul was at the time, probably the second most educated man in the world (next to Gamaliel).
As a whole, Jews were a very self-centered people (as they remain today).
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My take away from the soldiers reaction was that a Hebrew speaking in Greek was unusual.