In killing the Prophet Joseph Smith, they did not kill “Mormonism,” and they cannot kill it unless they kill all the “Mormons,” for if they leave a single Latter-day Saint living he will cry to the people to repent of their sins and return to the Lord, and the Lord will work with him to gather the righteous, build up His kingdom, build up Zion, and establish Jerusalem no more to be thrown down.

– Brigham Young, 8/17/1867