Flesh and blood,
You, brother mine, that entertain’d ambition,
Expell’d remorse and nature; who, with Sebastian,
Whose inward pinches therefore are most strong,
Would here have kill’d your king; I do forgive thee,
Unnatural though thou art.

– William Shakespeare

The Tempest, Act 5 Scene 1. Prospero excoriates his brother Antonio, saying that he followed his ambition and lost compassion and their natural bond as brothers. With Sebastian he was ready to kill his king Alonso. However, despite the fact that Prospero brands Antonio as "unnatural" – i.e. a monster – he decides to forgive him.