In the book "Voyager" by Diana Gabaldon, a character named Jamie expresses disbelief and disapproval towards another character's actions or thoughts. His cold remark suggests a deep sense of shock, implying that he finds the other person's reasoning to be completely irrational. The intensity of his response reflects not only surprise but also disappointment, indicating a strong emotional reaction.

This exchange highlights the tension between the characters, as Jamie’s statement, "You have lost your mind," serves as a sharp critique of the other person’s judgment. It underscores the themes of loyalty and the struggle to understand one another amidst challenging circumstances. Such moments in the narrative enhance character development and illustrate the complexities of their relationships.