" I don't believe it, I won't believe it"

• Analysis

  Sybil’s refusal to accept the truth reflects her wilful blindness,  She is either blind or, I think, wilfully blind. She deliberately ignores inconvenient facts, such as Eric’s relationship with Eva, to maintain her prejudiced worldview 
• Alternative interpretation

  Sybil’s denial also highlights how her blindness is shaped by societal pressures. Sybil isn’t just prejudiced; she’s also a victim of that society. She refuses to confront uncomfortable truths because doing so would challenge her position in a patriarchal society
• Themes

  Wilful Ignorance: Sybil’s refusal to face the truth reflects the moral blindness of the upper class

  Patriarchy and Social Prejudice: Sybil’s blindness also symbolises how women in a patriarchal society are taught to turn a blind eye to injustice 
• Writers intention

  Priestley uses Sybil’s name, derived from the prophetic Greek Sybils, ironically. Unlike the Sybil's, who could see the future, Sybil is deliberately blind to the truth. This highlights Priestley’s critique of the upper class’s moral blindness and the societal structures that enable it.