Sojourning Under the Sun: Sabbath Conforming: Marriage (Matthew 5:27-32)

Christ goes through the law and lays out the challenge of the seventh commandment.  This is another commandment that one might think is rather easy to keep, but is this really such an easy command to keep?  Is this one of the least commands or do we make it one of the least commands?  What are some of the implications regarding this commandment?