Then we went to Constantinople and they led us to the place where they worship their God, and we knew not whether we were in heaven or earth, for on earth there is no such vision nor beauty, and we do not know how to describe it; we only know that God dwells among men. We cannot forget that beauty.
~ Primary Chronicle of the Sent by Prince Vladimir of Kiev-Rus to Constantinople, as quoted in The Story of Christianity by David Bentley Hart, The Story of Christianity (n.p.: Quercus Books, 2008)
