" Quiet is no certain pledge of permanence and safety. Trees may flourish and flowers may bloom upon the quiet mountain side, while silently the trickling rain-drops are filling the deep cavern behind its rocky barriers, which, by and by, in a single moment, shall hurl to wild ruin its treacherous peace. "

― Candice Millard , Destiny of the Republic: A Tale of Madness, Medicine and the Murder of a President