Chapell advocates the use of illustration as a powerful tool within the larger homiletic structure. Illustration can assist the listener by bridging the gap between abstract principle and lived reality. In this manner, it carries the listener toward application showing how the truth actually applies, and convincing the listener the truth can actually be of use in real life. For anyone questioning the value or propriety of illustration in sermons, Chapell makes a strong case.
The book not only advocates the importance of illustration, but also provides valuable insight into how to craft effective illustrations. Using the analogy of a snapshot, Chapell explains how to frame the shot, and then how fill the frame. Though I've been preaching for several years, and though he was my homiletics instructor, there was much of value to me in this section.
The final section deals with further practical issues for using illustrations well. Chapell explores in detail how the preacher's use of illustration (or non-use) will reveal his character to his listeners. He also raises important cautions in the practice of illustration. Finally he provides some guidance for the process of finding and filing illustrations. Most preachers should find some useful ideas in that section.
As a final note I would add that there is an appendix included, which explores the limits of Narrative Preaching. I found it to be interesting and helpful. This essay provides a solid orientation to the underlying assumptions of Narrative Preaching. Chapell then argues those assumptions inadequately appropriate the imago dei and the work of the Spirit in our understanding of the text. He advocates the importance of wedding propositions and narrative in the overall approach to preaching.
I would, in summary, recommend this book to anyone wanting to better appreciate the value of illustration, and to anyone wanting to strengthen their craft when it comes to illustrations.