No More Learning

Bora. Yea, my lord; but I can cross it.
John. Any bar, any cross, any impediment will be med'cinable to me.
I am sick in displeasure to him, and whatsoever comes athwart his
affection ranges evenly with mine. How canst thou cross this
marriage?
Bora. Not honestly, my lord, but so covertly that no dishonesty
shall appear in me.
John. Show me briefly how.
Bora. I think I told your lordship, a year since, how much I am in
the favour of Margaret, the waiting gentlewoman to Hero.
John. I remember.
Bora.
I can, at any unseasonable instant of the night, appoint her
to look out at her lady's chamber window.
John. What life is in that to be the death of this marriage?
Bora. The poison of that lies in you to temper. Go you to the
Prince your brother; spare not to tell him that he hath wronged
his honour in marrying the renowned Claudio (whose estimation do
you mightily hold up) to a contaminated stale, such a one as
Hero.
John. What proof shall I make of that?
Bora. Proof enough to misuse the Prince, to vex Claudio, to undo
Hero, and kill Leonato. Look you for any other issue?
John. Only to despite them I will endeavour anything.
Bora. Go then; find me a meet hour to draw Don Pedro and the Count
Claudio alone; tell them that you know that Hero loves me; intend
a kind of zeal both to the Prince and Claudio, as--in love of
your brother's honour, who hath made this match, and his friend's
reputation, who is thus like to be cozen'd with the semblance of
a maid--that you have discover'd thus. They will scarcely believe
this without trial.