The expression, You shall know the truth and the truth shall set you free has New Testament origins and so should probably not serve as the basis for a paper on the importance of scientific literacy, but if we can divorce the saying from its context it would indeed serve as a touchstone for Carl Sagans insistence on the importance of scientific literacy which he expresses with especial eloquence in The Demon-Haunted World: Science as a Candle in the Dark as well as throughout much of the rest of his writings. For truth does set us free.