Of the witnesses to the Book of Mormon, David Whitmer survived the longest after his experience with the plates, the angel and so forth. He lived until 1888. For fully fifty years, Whitmer lived among “Gentiles,” outside of the Church of Jesus Christ of Latter-day Saints and separated from the Mormon people. But he continually reaffirmed (and never denied) his testimony of the book.
Here is another passage from his account, as it is printed in Hyrum L. Andrus and Helen Mae Andrus, Personal Glimpses of the Prophet Joseph Smith (American Fork, UT: Covenant Communications, 2009):
I will now give you a description of the manner in which the Book of Mormon was translated. Joseph Smith would put the seer stone into a hat, and put his face in the hat, drawing it closely around his face to exclude the light; and in the darkness the spiritual light would shine. A piece of something resembling parchment would appear, and on that appeared the writing. One character at a time would appear, and under it was the interpretation in English. Brother Joseph would read off the English to Oliver Cowdery, who was his principal scribe, and when it was written down and repeated to Brother Joseph, to see if it was correct, then it would disappear, and another character with the interpretation would appear.
Thus the Book of Mormon was translated by the gift and power of God, and not by any power of man, which is true because Joseph Smith was a man of limited education and could hardly write legibly. (44-45)