In the final part of this scene, Portia tries to reason with Shylock
Do you recognize the same repetition here as in the beginning?
Portia talks about mercy and its quality and how those who show mercy can become like god.
What does Portia want to achieve by talking about mercy to Shylock?
Finally, we get to Portia telling Shylock: "This bond doth give thee here no jot of blood; the words expressly are pound of flesh." Thus Portia uses Shylock's argument about disregarding the law against him.