
In The Merchant of Venice, the central themes are Justice and Mercy, Love and Hate, Appearance and Reality and Value and Worth. Together, they help us to learn about the characters and understand why they act as they do.

We hear a lot about Mercy in this play. It is held up as an ideal, especially in Portia's famous courtroom speech:
The quality of mercy is not strained: It droppeth as the gentle rain from heaven.Upon the place beneath. It is twice blessed:It blessed him that gives, and him that takes.
Shylock on the other hand is determined to get revenge on Antonio. Even when offered money his hatred and need for revenge are paramount.
My deed upon my head! I crave the law,The penalty and forfeit of my bond.
We see here two differing ideas about the relationship between mercy and justice. In Elizabethan times Portia would have been seen as representing the Christian idea of mercy. The New Testament advocates that Christians should "turn the other cheek" rather than exact revenge from the the person who has wronged them. Shylock's view of justice is the complete opposite: it is "an eye for an eye, a tooth for a tooth" - which interestingly is an idea of justice which can be derived from the Old Testament .
Shylock also believes that Christians are hypocritical about their mercy - that in reality they are as keen on revenge as he is: "If a Jew wrong a Christian, what is his humility? Revenge. If a Christian wrong a Jew, what should his sufferance be by Christian example? Why, revenge!"
(Do you agree with Shylock's argument? Shylock has clearly had experience of a Christian 'justice' which discriminates against Jews.)
The end of the play could be interpreted as underlining Shylock's point. Portia makes a very persuasive speech about mercy, yet when it come to deal out justice, she is less generous than her words. She emphasises that Shylock shall have "all justice"
- and catches him out as she knows the law better than he does. Portia refuses to let Shylock back out of the deal, saying "He shall have merely justice and his bond."
Just as Shylock missed his chance to be merciful, so Portia comes back with the full weight of the laws against him and shows no mercy. Having begged Shylock to show mercy to Antonio, she seems less than merciful to him. So - to what extent does Portia actually demonstrate justice and mercy?
Here are some other questions to ask yourself about Justice and Mercy in the play:
"an inhuman wretch, / Incapable of pity, void and empty / From any dram of mercy."Given that attitude, is it ever likely that Shylock will get a fair hearing?

Scales of Justice