PORTIA

Therefore, for fear of the worst, I pray thee, set a
deep glass of rhenish wine on the contrary casket,
for if the devil be within and that temptation
without, I know he will choose it. I will do any
thing, Nerissa, ere I'll be married to a sponge.

NERISSA

You need not fear, lady, the having any of these
lords: they have acquainted me with their
determinations; which is, indeed, to return to their
home and to trouble you with no more suit, unless
you may be won by some other sort than your father's
imposition depending on the caskets.

PORTIA

If I live to be as old as Sibylla, I will die as
chaste as Diana, unless I be obtained by the manner
of my father's will. I am glad this parcel of wooers
are so reasonable, for there is not one among them
but I dote on his very absence, and I pray God grant
them a fair departure.

Much Ado About Nothing

Act IV, scene 1

“Don Pedro, Prince of Arragon, pays a visit to Leonata, the governor of Messina, while returning from a victorious campaign against his rebellious brother, Don John. Accompanying him are two of his officers, Benedick and Claudio. While in Messina, Claudio falls for Leonato's daughter, Hero; Benedick verbally spars with Beatrice, the governor's niece. The budding love between Claudio and Hero prompts Don Pedro to arrange with Leonato for the marriage.  Meanwhile, the trickery begins as Don Pedro (with the help of Leonato and Claudio) attempts to sport with Benedick and Beatrice in an effort to make the two of them fall in love. Likewise, Hero and her waiting woman help to set up Beatrice. Both Benedick and Beatrice will think that the other has professed a great love for them.  The marriage of Claudio to Hero is set to go. Don John—ostensibly reconciled with his brother—despises Claudio, however, and plots against him. First, he tells Claudio that Pedro wants Hero for himself; next, he enlists the aid of his henchman Borachio and one of Hero's gentlewomen disguised as Hero to stage an encounter that will bring Hero's virtue into question. Claudio falls for the ruse and denounces Hero at the altar.”

In this scene Beatrice, distraught over the dishonor to her cousin Hero, asks Benedick to seek revenge on Claudio.  Though Claudio is his friend he feels compelled to prove to Beatrice that he loves her and agrees to help.

BENEDICK

Lady Beatrice, have you wept all this while?

BEATRICE

Yea, and I will weep a while longer.

BENEDICK

I will not desire that.

BEATRICE

You have no reason; I do it freely.