There is a force in trading that does not come from the market but from the inner need for self-consistency: when reality conflicts with judgment, people tend to adjust their cognition rather than their behavior. This article analyzes three manifestations of cognitive dissonance: rationalization after decision-making, commitment escalation, and belief drifting with the results. It provides a recording method for writing down the reasons before opening a position and checking whether the subsequent explanation is consistent during review. It also emphasizes the separation of judgment and self-worth to reduce the interference of self-deception on the quality of decision-making.