Abstract
This chapter introduces many of the themes that are developed in more detail in later contributions: the notion that deception and self-deception are essential to self-maintenance; the suspicion that philosophers place too high a price on the truth, and naively fail to recognize the importance of false beliefs and even lies for human flourishing; the complex nature of both deception and self-deception, and their importance to communication; the observation that lies and self-deceptions are crucial to social interaction; the difficulties of defining lie and deception; and the suggestion that it may be the motives behind a deception and not the deception itself that people find morally blameworthy. Nevertheless, it stresses that the truth is to be prized, and deceptions are to be viewed as a kind of necessary evil.