I know that the Book of Mormon is the word of God because I have treasured it.

As a quorum member, as a home teacher, and as a missionary, you cannot help people repair spiritual damage unless your own faith is vibrant. That means far more than reading the scriptures regularly and praying over them. The prayer in the moment and quick glances in the scriptures are not preparation enough. The reassurance of what you will need comes with this counsel from the 84th section of the Doctrine and Covenants: “Neither take ye thought beforehand what ye shall say; but treasure up in your minds continually the words of life, and it shall be given you in the very hour that portion that shall be meted unto every man.”2

That promise can be claimed only if we “treasure up” the words of life and do it continually. The treasuring part of that scripture has meant for me a matter of feeling something about the words. For instance, when I have gone to try to help someone wavering in his or her faith about the Prophet Joseph Smith’s divine calling, feelings come back to me.

It is not only the words from the Book of Mormon. It is a feeling of assurance of truth that comes whenever I read even a few lines from the Book of Mormon. I cannot promise that it will come to every person infected with doubt about the Prophet Joseph or the Book of Mormon. But I know Joseph Smith is the Prophet of the Restoration. I know that the Book of Mormon is the word of God because I have treasured it.

Henry B. Eyring, October 2013 General Conference, Bind Up Their Wounds