Lumen Fidei: A Summary of Francis’ First Encyclical Saints, Martyrs, and Heroes, Pope Francis | | July 26, 2013 Lumen Fidei (The Light of Faith) is the first encyclical signed by Pope Francis. Jim Hug, S.J., former Center of Concern president, provides a precis, and we’ve added a few summary questions to help begin the discussion. Already a member?Log in here!