Joseph Smith did not write that, why are you saying he did? He was dead when this was written in 1845. Remember that the church teaches that the U&T is either the spectacles or the seer stone.
Its from the JS Papers, why argue with me about who wrote it.... Lucy Mack Smith diary writing about what JS said to her.
This rationale also explains why he and Oliver wrote the eight essays on Church history (published as Letters I - VIII in the 1834-5
Messenger and Advocate). In Letter I, published in October 1834, Oliver declared "Day after day I continued, uninterrupted, to write from his mouth, as he translated,
with the Urim and Thummim, or, as the Nephites would have said, “Interpreters,” the history, or record, called “The book of Mormon.” (
Messenger and Advocate I.1:14 ¶4)
D&C 10: 1-3
1 Now, behold, I say unto you, that because you delivered up
those writings which you had power
given unto you to translate
by the means of the Urim and Thummim, into the hands of a wicked man, you have lost them.
2 And you also lost your gift at the same time,
and your mind became darkened.
3 Nevertheless, it is now restored unto you again;
The earliest extant account of the Urim and Thummim is an 1832 interview in the
Boston Investigator (shown below).
Later, in January 1833, W.W. Phelps explained the term to his readers:
The book of Mormon, as a revelation from God, possesses some advantage over the old scripture: it has not been tinctured by the wisdom of man, with here and there an Italic word to supply deficiencies.—It was translated by the gift and power of God, by an unlearned man, through the aid of a pair of Interpreters, or spectacles—
(known, perhaps, in ancient days as Teraphim, or Urim and Thummim) and while it unfolds the history of the first inhabitants that settled this continent, it, at the same time, brings a oneness to scripture,
(Evening and Morning Star I.8:58 ¶6)