" There are four elements to our passage, and they need to be put in outline form perhaps to see how this passage is put together: First, the claim of fulfillment (5:17). Second, an elucidation of the claim (5:18). Third, the consequences of the elucidated claim (5:19). Fourth, an elucidation of the consequences (5:20). "

― Scot McKnight , Sermon on the Mount (The Story of God Bible Commentary)