In "New Moon" by Stephenie Meyer, the quote "Why can you believe the lie, but not the truth?" reflects a common struggle between perception and reality. It expresses the idea that people often accept falsehoods more readily than the truth, which can lead to confusion and emotional turmoil. This theme resonates throughout the book, as characters grapple with their feelings and the challenges of their relationships.

The dichotomy between truth and deception is central to the narrative, influencing the decisions and emotional states of the characters. This quote serves as a poignant reminder of how personal biases and desires can skew one's judgment, making it difficult to embrace what is real over what comforts or excites. It underlines the complexity of human emotions in the face of love and loss.