Who passeth all understanding. God unknown is still the God of Dionysius, and He is still to be worshipped unknowingly. There is a tradition that Dionysius erected the altar in Athens to God unknown, as author of the inexplicable darkness, which he observed in Egypt, and found afterwards from St. Paul to have been contemporaneous with the Crucifixion. Did St. Paul adapt his discourse at Athens to the conversion of Dionysius?