Answer: The paragraph above is an excerpt from William Shakespeare's The tempest. Act 5 scene 1. In this scene, Prospero the wizard, is speaking to Ariel.
Prospero who is the protagonist of the play is Ariel's master. Ariel is a free spirit who is bound to serve Prospero, who rescued him from a tree in which he was trapped by a witch named Sycorax, who previously inhabited the island