“Once we have a foundational testimony of the Book of Mormon, then any question or challenge we confront in life, however difficult it may seem, can be approached with faith,” Brother Callister said. “Why? Because the keystone of our religion — the Book of Mormon and its witness of Jesus Christ — has also become the keystone of our testimony.”

Brother Callister's talk may be found at  http://universe.byu.edu/2016/11/01/tad-r-callister-speaks-on-book-of-mor...  He discusses, among other things, the reasons critics through the years have used to discredit Joseph and the Book of Mormon.