You are all mistaken; I know the murderer. Justine, poor, good Justine, is innocent.
Chapter 7 · Victor Frankenstein
Context
After learning that Justine has been accused of William's murder, Victor insists to his family that they are wrong and that he knows the true killer. He affirms Justine's innocence with certainty.
Analysis
Victor's construction—"You are all mistaken; I know"—sets his private knowledge against collective error, positioning him as the sole possessor of truth. Yet the irony cuts two ways: he is correct about Justine's innocence but refuses to speak the knowledge that would save her, making his certainty functionally useless. His repetition of "Justine" with the modifiers "poor, good" performs sympathy while doing nothing.
Essay Tip
Use this to argue that the novel exposes the moral emptiness of private knowledge—Victor's certainty about Justine's innocence is worthless because he refuses to make it public, revealing how truth without testimony is just another form of complicity.