Joseph Smith
"No unhallowed hand can stop the work from progressing; persecutions may rage, mobs may combine, armies may assemble, calumny may defame, but the truth of God will go forth boldly, nobly, and independent, till it has penetrated every clime, swept every country, and sounded in every ear, till the purposes of God shall be accomplished, and the Great Jehovah shall say the work is done." (History of the Church, 4:540 as taken from Latter-day Commentary on the Book of Mormon compiled by K. Douglas Bassett, p. 449)
Ezra Taft Benson
"We live in a time when the devil is on the loose and is working among the Saints to thwart and tear down the work of God. But he will not succeed. Individuals may fall and there may be those who betray sacred covenants, but the kingdom of God will roll forward until it reaches its decreed destiny to fill the entire earth.
"I carry in my calendar book a passage of scripture that I sometimes use to remind myself and others about the eventual outcome of efforts to destroy the Church: 'No weapon that is formed against thee shall prosper; and every tongue that shall revile against thee in judgment thou shalt condemn. This is the heritage of the servants of the Lord, and their righteousness is of me, saith the Lord.' (3 Nephi 22:17.)
"The Lord has prospered this work and will continue to do so. He is close to His servants, even within whispering distance of heaven." (Come Unto Christ, p. 22-3)
Boyd K. Packer
"On one occasion when I, along with President Benson, was the subject of a great deal of criticism by the local and national media, he sent me a card which read: No weapon that is formed against thee shall prosper; and every tongue that shall revile against thee in judgment thou shalt condemn. This is the heritage of the servants of the Lord, and their righteousness is of me, saith the Lord. (3 Nephi 22:17.)
"I was greatly strengthened by the message." (That All May Be Edified, p. 250)