For you, most wicked sir, whom to call brother
Would even infect my mouth, I do forgive
Thy rankest fault; all of them; and require
My dukedom of thee, which perforce, I know,
Thou must restore.
– William Shakespeare
The Tempest, Act 5, Scene 1. Prospero clearly has an intense dislike for Antonio because of his betrayal of him, saying that to call him brother would "infect" his mouth. But he decides to be the bigger man and not follow the path of vengeance and vindictiveness. Instead he decides to forgive Antonio, but requires his dukedom back which he says Antonio must restore.