Themes are the fundamental and often universal ideas explored in a literary work.
On the surface, the main difference between the Christian characters and Shylock appears to be that the Christian characters value human relationships over business ones, whereas Shylock is only interested in money. The Christian characters certainly view the matter this way. Merchants like Antonio lend money free of interest and put themselves at risk for those they love, whereas Shylock agonizes over the loss of his money and is reported to run through the streets crying, “O, my ducats! O, my daughter!” (II.viii.15). With these words, he apparently values his money at least as much as his daughter, suggesting that his greed outweighs his love. However, upon closer inspection, this supposed difference between Christian and Jew breaks down. When we see Shylock in Act III, scene i, he seems more hurt by the fact that his daughter sold a ring that was given to him by his dead wife before they were married than he is by the loss of the ring’s monetary value. Some human relationships do indeed matter to Shylock more than money. Moreover, his insistence that he have a pound of flesh rather than any amount of money shows that his resentment is much stronger than his greed.
Just as Shylock’s character seems hard to pin down, the Christian characters also present an inconsistent picture. Though Portia and Bassanio come to love one another, Bassanio seeks her hand in the first place because he is monstrously in debt and needs her money. Bassanio even asks Antonio to look at the money he lends Bassanio as an investment, though Antonio insists that he lends him the money solely out of love. In other words, Bassanio is anxious to view his relationship with Antonio as a matter of business rather than of love. Finally, Shylock eloquently argues that Jews are human beings just as Christians are, but Christians such as Antonio hate Jews simply because they are Jews. Thus, while the Christian characters may talk more about mercy, love, and charity, they are not always consistent in how they display these qualities.
The conflict between Shylock and the Christian characters comes to a head over the issue of mercy. The other characters acknowledge that the law is on Shylock’s side, but they all expect him to show mercy, which he refuses to do. When, during the trial, Shylock asks Portia what could possibly compel him to be merciful, Portia’s long reply, beginning with the words, “The quality of mercy is not strained,” clarifies what is at stake in the argument (IV.i.179). Human beings should be merciful because God is merciful: mercy is an attribute of God himself and therefore greater than power, majesty, or law. Portia’s understanding of mercy is based on the way Christians in Shakespeare’s time understood the difference between the Old and New Testaments. According to the writings of St. Paul in the New Testament, the Old Testament depicts God as requiring strict adherence to rules and exacting harsh punishments for those who stray. The New Testament, in contrast, emphasizes adherence to the spirit rather than the letter of the law, portraying a God who forgives rather than punishes and offers salvation to those followers who forgive others. Thus, when Portia warns Shylock against pursuing the law without regard for mercy, she is promoting what Elizabethan Christians would have seen as a pro-Christian, anti-Jewish agenda.
The strictures of Renaissance drama demanded that Shylock be a villain, and, as such, patently unable to show even a drop of compassion for his enemy. A sixteenth-century audience would not expect Shylock to exercise mercy—therefore, it is up to the Christians to do so. Once she has turned Shylock’s greatest weapon—the law—against him, Portia has the opportunity to give freely of the mercy for which she so beautifully advocates. Instead, she backs Shylock into a corner, where she strips him of his bond, his estate, and his dignity, forcing him to kneel and beg for mercy. Given that Antonio decides not to seize Shylock’s goods as punishment for conspiring against him, we might consider Antonio to be merciful. But we may also question whether it is merciful to return to Shylock half of his goods, only to take away his religion and his profession. By forcing Shylock to convert, Antonio disables him from practicing usury, which, according to Shylock’s reports, was Antonio’s primary reason for berating and spitting on him in public. Antonio’s compassion, then, seems to stem as much from self-interest as from concern for his fellow man. Mercy, as delivered in The Merchant of Venice, never manages to be as sweet, selfless, or full of grace as Portia presents it.
Throughout the play, Shylock claims that he is simply applying the lessons taught to him by his Christian neighbors; this claim becomes an integral part of both his character and his argument in court. In Shylock’s very first appearance, as he conspires to harm Antonio, his entire plan seems to be born of the insults and injuries Antonio has inflicted upon him in the past. As the play continues, and Shylock unveils more of his reasoning, the same idea rears its head over and over—he is simply applying what years of abuse have taught him. Responding to Salarino’s query of what good the pound of flesh will do him, Shylock responds, “The villainy you teach me I will execute, and it shall go hard but I will better the instruction” (III.i.60–61). Not all of Shylock’s actions can be blamed on poor teachings, and one could argue that Antonio understands his own culpability in his near execution. With the trial’s conclusion, Antonio demands that Shylock convert to Christianity, but inflicts no other punishment, despite the threats of fellow Christians like Gratiano. Antonio does not, as he has in the past, kick or spit on Shylock. Antonio, as well as the duke, effectively ends the conflict by starving it of the injustices it needs to continue.