nine o'clock
Having tossed on a feverish couch for upward of an hour , -- unable to banish from his mind the cold blooded plot which Nisida and Demetrius had resolved upon in order to consign Flora Francatelli and her equally innocent aunt to the stake , -- Wagner at last slept through sheer exhaustion . Then Christianus Rosencrux appeared to him in a dream and said : -- `` Heaven hath chosen thee as the instrument to defeat the iniquitous purposes of Riverola in respect of two guiltless and deserving women . Angelo Duras is an upright man ; but he is deluded and misled by the representations made to him by Nisida , through his brother , the physician , relative to the true character of Flora . In the evening at nine o'clock , hie to Angelo Duras -- command him in the name of justice and humanity , to do his duty toward his clients -- and he will obey thee . Then , having performed this much , speed thou without delay to Leghorn , and seek the grand vizier , Ibrahim Pasha . To him shalt thou merely state that Demetrius is a traitor , and that tremendous perils hang over the heads of the vizier 's much-loved relatives . Manifest no hatred to the vizier on account of his late treacherous intention with regard to the honor of Nisida : for vengeance belongeth not to mortals .