* 1819 revivals differ from accounts given by Joseph's brother, William Smith, and Oliver Cowdery who both plainly tell about the well-documented 1824 revivals and a specific preacher who, independently, can be shown was not in the area until 1824, and how those revivals and that specific preacher motivated Joseph to find out which church was true.
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* The only accounts available all speak of the Moroni vision, until 1832.
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Back to the topic of the First Vision, I think if all the details in the 1838 version and other versions of the First Vision are given due consideration, I think the most informed opinion is that the First Vision, if it happened at all, happened in 1824 or 1823, not 1820 (which isn't necessarily a problem if Joseph was really bad with dates).
From all I've read, I believe moroni's alleged visitation in 1823 slowly morphed into the "first visitation of angels" and then into the "first vision," while somehow maintaining its own identity.
I thought there were well documented revivals in 1823 as well, no?
The first vision had to be pushed back and I wonder why 1820 was chosen.
As to your letter-- good shit, brother! You have some stuff I've never read or heard of before. Great job. I trust your letter will no doubt strengthen your father's beliefs.