King Lear : Act 3, Scene 5

           Enter CORNWALL and EDMUND.

my revenge my revenge [on Gloucester for aiding King Lear] his house Gloucester's house
  1   I will have my revenge ere I depart his house.

How . . . of I am afraid to think of how I may be condemned for letting my loyalty [to you] override my natural bonds [to my father].
  2   How, my lord, I may be censured, that nature thus
  3   gives way to loyalty, something fears me to think
  4   of.

  5   I now perceive, it was not altogether your brother's
his death Gloucester's death
  6   evil disposition made him seek his death; but a
provoking merit, set a-work by a reprovable badness in himself i.e., Gloucester's own wickedness deservedly triggered the evil in Edgar ("merit" = evil which merits punishment)
  7   provoking merit, set a-work by a reprovable
  8   badness in himself.

  9   How malicious is my fortune, that I must repent to
 10   be just! This is the letter he spoke of, which
approves him an intelligent party to the advantages of France proves him a spy and informer in the aid of France
 11   approves him an intelligent party to the advantages
 12   of France: O heavens! that this treason were not,
 13   or not I the detector!

 14   Go with me to the duchess.

 15   If the matter of this paper be certain, you have
 16   mighty business in hand.

 17   True or false, it hath made thee Earl of
 18   Gloucester. Seek out where thy father is, that he
apprehension arrest
 19   may be ready for our apprehension.

      EDMUND [Aside.]
stuff his suspicion increase suspicion of him
 20   If I find him comforting the king, it will stuff
 21   his suspicion more fully.
           [To Cornwall.]
 21                                           I will persevere in
 22   my course of loyalty, though the conflict be
my blood filial duty
 23   sore between that and my blood.

 24   I will lay trust upon thee; and thou shalt find a
 25   dearer father in my love.