speak when you're angry

The vampire looked from the golem to Vimes.

‘You gave one of them a VOICE?’ he said.

'Yes,’ said Dorfl.  He reached down and picked up the vampire in one hand.  'I Could Kill You,’ he said.  'This Is An Option Available To Me As A Free-Thinking Individual But I Will Not Do So Because I Own Myself And I Have Made A Moral Choice.’

'Oh, gods,’ murmured Vimes under his breath.

'That’s BLASPHEMY,’ said the vampire.

He gasped as Vimes shot him a glance like sunlight.  'That’s what people say when the voiceless speak.  Take him away, Dorfl.  Put him in the palace dungeons.’
—  Terry Pratchett, “Feet of Clay”