This Sunday and through October we will begin a new sermon series during which we will reflect on the great text of Matthew's gospel, the Sermon on the Mount. It is, in many ways, the great charter of the Christian life, what our Lord expects us, and even demands us, to be. This week Jesus launches into the sermon by first telling us less what we should do--Jesus seldom trafficked in moralisms--than who we are. "You are the salt of the earth," says the Lord, "and the light of the world." This Sunday let's consider it.