The following two chapters cover topics where Christians have tended to struggle. Part of the difficulty of these topics is their counter-cultural nature. The idea of manna from Exodus 16 reveals an idea of work and possessions that is quite different from our society's ideas about those things. Secondly, we tend to view the ideas of the Sabbath and the Ten Commandments as rules or regulations that need to be strictly followed. How does the story of manna in the wilderness challenge those perceptions about the Sabbath?