But he’s since become their slave, and rants with furious regret: “And then I loved thee,/ And showed thee all the qualities o’ th’ isle/ The fresh springs, brine pits, barren place and fertile./ Cursed be I that did so!” With his thunderous language and seething anger, Caliban constantly reminds Prospero of what came before: this island’s mine by Sycorax my mother, Which thou takest from me.