Read it through once

DUKE. [_To Claudio aside_.] Son, I have overheard what hath passed between you and your sister. Angelo had never the purpose to corrupt her; only he hath made an assay of her virtue, to practise his judgement with the disposition of natures. She, having the truth of honour in her, hath made him that gracious denial which he is most glad to receive. I am confessor to Angelo, and I know this to be true; therefore prepare yourself to death. Do not satisfy your resolution with hopes that are fallible. Tomorrow you must die; go to your knees and make ready.