 Another atheistic pragmatic argument is that of Sigmund Freud (1856–1939), who in The Future of an Illusion (1927) contends that religious belief perpetuates psychological immaturity among individuals, and cultural immaturity on the social level. To make sense of Freud’s argument requires knowing that he employed the term “illusion” in an idiosyncratic way. An illusion in the Freudian sense is a belief that is caused by and in turn satisfies a deep psychological need or longing. Illusions are not held rationally. Illusions stick even in the absence of any supporting evidence. Indeed, according to Freud, they stick even in the face of strong contra-evidence. An illusion could be true, but often they are not. Delusions are false illusions. Religious belief Freud thought was an illusion. While it may have been a beneficial illusion at an earlier time, it no longer is. The religious illusion now, Freud asserted, inhibits scientific progress, and causes psychological neuroses, among its other pernicious effects.