I say, by sorcery he got this isle;
From me he got it. If thy greatness will
Revenge it on him, – for I know thou darest,
But this thing dare not.

– William Shakespeare

The Tempest, Act 3, Scene 2. Having made allies of Stepheno and Trinculo, Caliban is asking Stephano to help him take revenge on the usurper Prospero for taking the island from him using sorcery. Trinculo the jester he dismisses as not being brave enough – "this thing dare not."