How do we know we have heard the sermon on the mount correctly?  How do we know the goal of Jesus words have been accomplished in our lives, in our community?  Jesus leaves no room to guess in the conclusion of his sermon.  He gives a short parable of what it looks like to hear and do what he says, versus hearing and not doing what he says. How does this parable help us examine our own lives?  Are we in danger of building on sand, or have we learned to build on the rock?