Definitely gets dry in the middle, but it's a strong and helpful book on preaching if one has the endurance to press on. The last two chapters were very rich and encouraging, and I wish I had known to jump to those while I was stuck in the middle, to appreciate them more. I'll return to them after a time.
One great point he makes and re-references later is the ability of the Word to create its own listeners. So much of sermon preparation deals with prepping the Word for the listeners, almost as if we are cracking shells from peanuts to deliver them in a neat, clean bowl, ready-to-eat. But we're robbing people of the joy of doing all that themselves. Often in our prep, we end up subliminally dealing with people's issues for them, answering questions for them, etc., and by the time we deliver the sermon, we neglect to allow people to truly encounter the living, life-changing Word in its fullness. Great reminder.
He also talks about how form shapes a congregations faith, meaning the sermon form. Meaning, if every sermon is delivered in the form of an argument, the people will gradually interpret faith in that way. The same is true of other forms when overused.
Lastly, at the end, he encourages preachers to remind themselves that there is always one person in the room who is actively listening and who, because of the sermon, "may have a clearer vision, a brighter hope, a deeper faith, a fuller love. That person is the preacher" (222). So in other words, study and preach your way into passion and change from your own encounter with the Word, and then let God shine through you and bring the increase in his own way as you passionately preach your guts out!