How does Caliban utilize the languages taught by Prospero In The Tempest William Shakespeare shows Caliban as the wild native of the island Prospero teaches him language to make him civil But Caliban uses that language to curse express anger and reveal his pain and truth Prospero Teaches Caliban to Speak Prospero and Miranda first came to the island Prospero wanted to educate Caliban He taught him words and speech Prospero proudly says I pitied thee took pains to make thee speak This shows his kindness Prospero hoped language would make Caliban wise and gentle But Caliban learned words not good manners Instead of becoming polite he became more aware of his suffering Caliban Uses Language to Curse Prospero Caliban feels that Prospero has stolen his mother Sycorax s island So he uses the very language he learned to curse him He says You taught me language and my profit