What does the Bible say about self-deception?

Self-deception is a serious issue addressed in the Scriptures, particularly in Galatians 6:3, which states, 'For if a man think himself to be something when he is nothing, he deceiveth himself.' This passage highlights the dangers of pride and self-righteousness, indicating that believing oneself to be above other sinners can lead to a false sense of security in one's own morality. Scripture calls us to remember our true state without Christ—sinners in need of grace—and to approach others with humility and love rather than judgment.