The characters combine literally to mean “self-deceive, deceive-others.” The structure is elegant and direct. The deception starts internally (自欺) and then radiates outward to affect others (欺人). The repetition of 欺 (qī) emphasizes the persistent and core nature of the deception. It's not a one-time lie, but a state of being deceptive.
The concept of 自欺欺人 is deeply rooted in Confucian thought, which places a high value on sincerity (诚, chéng) and self-reflection. The term is often associated with the Neo-Confucian philosopher Zhu Xi (朱熹), who stressed that a virtuous person (君子, jūnzǐ) must be honest with themselves even when they are alone. To deceive oneself is therefore seen as a fundamental moral failure—the ultimate lack of integrity. If you cannot be honest with yourself, you cannot be honest with anyone. In Western culture, a close parallel is the phrase “burying one's head in the sand.” However, there is a key difference. “Burying one's head in the sand” primarily emphasizes willful ignorance to avoid a problem. 自欺欺人 goes a step further by including the active attempt to deceive others with this fabricated reality. It carries a stronger connotation of hypocrisy and a lack of character, not just avoidance. It's about maintaining a facade for both oneself and the outside world.
自欺欺人 is a common idiom used in a wide range of situations. Its connotation is always negative and critical. It's a powerful way to call out delusion and hypocrisy.