There are many secrets to great preaching. Perhaps too many to keep track of! Here is one:
Connect the details of whatever one is saying to the big picture (or, to a big picture, such as Who God Is, or Where this Parish Is Heading, or What Is the Gospel).
If we walk away from church saying, "There were lots of good things in that sermon ... but I am not sure what it was all about" then the chances are high that connection between 'the details' and the 'big picture' have not been made.
That then may provoke us to ask ourselves, 'What is my vision for this parish?' or 'What is my vision of God?'.
Preparation of sermons at that point may mean lifting our heads from the commentaries, smelling the roses, and thinking prayerfully while praying thoughtfully about what vision this sermon relates to.
Chances are then good that vision will fuel passion and passion will give the edge which means the words said will be the words heard by the congregation!