the merchant of venice

Bassanio then comes forward and offers Shylock the six thousand ducats as repayment for the loan. Shylock tells him that even if there were six times as much money offered to him, he would not take it. The Duke asks Shylock, "How shalt thou hope for mercy, rend'ring none?" (4.1.87). Shylock responds that he is doing nothing wrong, and compares his contract with Antonio to the Christian slave trade. He tells the Duke that he does not demand that the Christians should free their slaves, and therefore the Christians should not demand that he free Antonio.