Uncle Dale wrote:...the change-over in literary style was approximately coincident with
the decision to include redundant "that's," the word "wherefore," etc.
...
Although I suppose that the switch over to "wherefore" might be
claimed for about May of 1829, the predominance of the word in
Latter Day Saint scripture should probably be marked as beginning
in June of that year -- with the text that became BoC ch. XV.
Assuming that BoC XV is properly dated, the change-over in literary
style in the Book of Mormon perhaps came just after Ether 13 was dictated,
and the last "a"-prefixed verb was set down in the Nephite record.
I spoke earlier of "redundant that's," and one such example is seen
in the term "after that..."
Coincidentally (??) the "after that's" in the Book of Commandments
also begin in June of 1829, with BoC XV.
I take this to signify that far more than just exchanging
"therefore" for "wherefore" happened, c. May-July, 1829. A significant
shift in Book of Mormon language was instituted at that time -- at about
the time that the proto-Mormons (Smith, Cowdery, etc.) decided to
found their own, unique church, and not just reform existing
Christianity in something similar to Campbell's "restoration movement."
UD