It's the Apothecary's line: "My poverty, but not my will, consents."
He needs Romeo's money and wants to sell him the poison, but is reluctant and afraid to break the law. He agrees with Romeo's arguments that all the world's laws are against poor people, and none of those laws protect them. Still, he is afraid of suffering even more. He wants to say that objective circumstances force him to make this decision, while his person strongly disagrees with it. Romeo makes a fine and witty point in his next line, saying that the money is precisely there to appeal to his poverty, rather than his will.
