Why does Shylock nurse a grudge against Antonio in The Merchant of Venice?

Shakespeare “The Merchant of Venice” profoundly assembles on the platform upon laws and rules that are usually manipulated for brutal or gratuitous purposes. This ‘ancient grudge’ corrupts the transmission of bitterness and hatred between Christianity and Judaism pouring the aura of hypocrisy everywhere. We find Antonio, a Venetian merchant, habitual of criticizing all Jews for the inflated rates of interest on credit. Shylock, who nurses a long-standing grudge against Antonio, draws him into surprise by favoring for a loan. Shylock behavioral sense of gifting him three thousand ducats without interest tends to predict his single-minded pursuit towards brutality- by sanctioning a ‘will’ to a ‘pound of Antonio’s own flesh’. Despite Bassanio’s warnings, Antonio agrees to take the risks.
Shylock dictatorship of hideous expansion is worn out up by lifting up to multiple interpretations of ‘the pound of flesh’. The fact about their friendship is so noteworthy that Bassanio’s debt was to be rewarded with Antonio’s flesh. The blood of Antonio symbolizes Shylock’s own flesh and blood, as a repay for the loss of his daughter, Jessica. It shows a steady cue of the strictness in Shylock’s world, the numerical mind of Shylock demands revenge in exchange for his three thousand ducats. The other characters measured it in emotions with long metaphors and words, whereas Shylock resembles it more of numerical quantities, to evaluate revenge rather than forgiveness.

Shylock is a Jewish usurer who makes profits on his loans, so he resents the merchant Antonio, who lends money interest-free to people, which undercuts Shylock.

How like a fawning publican he looks!I hate him for he is a Christian,But more for that in low simplicityHe lends out money gratis and brings downThe rate of usance here with us in Venice.If I can catch him once upon the hip,I will feed fat the ancient grudge I bear him (Act I, Scene 3, lines 41-47).

As a Jew in Venice, Shylock is restricted to a certain area of the city called the ghetto, a crowded neighborhood where all Jews are required to live. During the Renaissance, Jews were perceived as a threat to Christians, so they were isolated in this city. There was also resentment toward their skills in medicine and banking, so they were prevented from entering such fields. As a result, Shylock is resentful because he feels he could rise much higher in Venetian society if he were not prohibited from certain opportunities and places, avenues open to someone like Antonio.