What does it mean to be Catholic? Is it about loyalty to the pope? To bishops? To particular doctrines like Mary’s Immaculate Conception or Transubstantiation? While these things certainly are a part of Catholic faith, what this lecture will suggest is that being Catholic rests ultimately on something much more foundational. This is the principle of “sacramentality,” the conviction that what we know and experience in our everyday lives gives us a glimpse of what God is really like.