This is a "mystical drama founded on the lives of Saints. Mr. Ticknor prefers it to the more celebrated 'Devotion of the Cross,' and says that it 'is commonly ranked among the best religious plays of the Spanish theatre in the seventeenth century.' In all that relates to the famous cave known through the middle ages as the 'Purgatory of Saint Patrick', as well as the Story of Luis Enius — the Owain Miles of Ancient English poetry."