Help interpreting Isabella's monologue in Act II Scene iv of Measure for Measure?

Question

I would like to perform this monologue (I like the play and this scene especially) and I understand most of it, but I'm really not sure about this section:

" O perilous mouths,

That bear in them one and the self-same tongue,

Either of condemnation or approof;

Bidding the law make court'sy to their will:

Hooking both right and wrong to the appetite,

To follow as it draws!"

Answer 1

She is complaining about Angelo asking her to commit the same sin as her brother Claudio to save her brother.   I assume since you know the show you don't need an explanation.  I modernized it below.

Oh dangerous mouths (or words that men say),

They can contain one tongue

That can condemn or approve;

They can change the law to bow to their will:

Right and wrong depends on what mood the person is in,

To do as they see fit!