Sabbath is one of those old-fashioned ideas we don't pay attention to much these days. After all, who can really afford to take a whole day off from life? In Jeremiah's day, the people's failure to keep Sabbath was the signal fire that they were faithless. Why is Sabbath so important? And what does it look like to keep Sabbath in our (way too) busy world? How is Sabbath an act of revolution?