Jesus is the Light and Life of the World. Elder Bednar recently gave a talk on this very subject: https://www.lds.org/broadcasts/article/christmas-devotional/2015/12/the-light-and-the-life-of-the-world?lang=eng
"At what point then is the approach of danger to be expected? I answer, if it ever reach us, it must spring up amongst us. It cannot come from abroad. If destruction be our lot, we must ourselves be its author and finisher. As a nation of freemen, we must live through all time, or die by suicide." --January 27, 1838