Mary enters the house and looks into the living room. A familiar appearance greets her from her husband’s chair. She thinks, “My husband is sitting in the living room,” and then walks into the den. But Mary misidentified the man in the chair. [Perhaps she only saw the back of his head.] It’s not her husband, but his brother, whom she had no reason to think was even in the country. However, her husband was seated along the opposite wall of the living room, out of Mary’s sight, dozing in a different chair.
Would you say that Mary knew her husband was in the living room or, because she was mistaken about the evidence, was she merely lucky?
Path of the Beagle 