Joseph Smith said the following in regards to the correctness of the Book of Mormon:
I told the brethren that the Book of Mormon was the most correct of any book on earth, and the keystone of our religion, and a man would get nearer to God by abiding by its precepts, than by any other book.
[Joseph Smith, Teachings of the Prophet Joseph Smith, comp. Joseph Fielding Smith, p. 194]
Note* Before anyone starts to bolster a geographical, cultural, or chronological argument with a supposed "mistake" in the text of the Book of Mormon, they would do well to ponder this verse and this quote. [Alan C. Miner, Personal Notes]