Hands-free narration of this study — good for the car.
Synopsis
Sermon materials fall into four classes: explanation, argument, illustration, and application. Explanation shows that a proposition is reasonable and Scriptural, drawing chiefly from the Bible itself and secondarily from Christian literature such as commentaries and dictionaries. Argument proves, demonstrates, or infers that a proposition is true or false; twelve practical forms are listed, including deduction, induction, cause-to-effect, effect-to-cause, a fortiori, analogy, tradition, testimony, experience, authority, reductio ad absurdum, and process of elimination, each illustrated from Scripture or daily reasoning. Illustrations are 'the windows of sermons,' letting light into abstract truth through one-word illustrations, analogy, anecdote, and story, drawn from the Bible, science, nature, fiction, poetry, history, and current events. Application or persuasion is what distinguishes a sermon from a lecture; the ideal sermon balances all four materials, since all explanation is dry, all argument contentious, and all illustration merely hortatory. The chapter closes with a practical filing system — an alphabetized card file for developing sermon ideas, texts, and illustrations, with separate files for past sermons and for unattached illustrations, to keep preparation from becoming a Friday-night burden.
Key points
- Sermon materials are four: explanation, argument, illustration, and application.
- Twelve forms of argument are described, from deduction and induction to testimony and reductio ad absurdum.
- Illustrations are called 'the windows of sermons,' letting light into abstract truth.
- Application or persuasion is what distinguishes a sermon from a mere talk or lecture.
- A balanced sermon uses all four materials; an alphabetized filing system helps gather and use them over time.
Key texts
- Isaiah 1:18
- Acts 24:25
- Galatians 6:7
- Matthew 6:30
- Acts 20:31
- 1 Corinthians 9:27
From the course book
How to Gather and Use Materials · pp. 67-72 (reader pages 67-72) · Open the reader
- “Someone has said, 'Illustrations are the windows of sermons.'” (p. 70)
- “It is this material which distinguishes a sermon from a talk or a lecture... The preacher seeks not for simple approval, but for action.” (p. 71)
- “If the sermon is all explanation, it will be too dry; if it is all argument, it will be too contentious; if it is all illustration, it will be too hortatory.” (p. 71)
Put it into practice
- Check that every sermon includes explanation, argument, illustration, and application in balance.
- Match the form of argument to the audience — deduction where the premise is shared, induction or testimony where it is not.
- Start an alphabetized card file (or digital equivalent) for sermon ideas, texts, and illustrations as they occur.
- Comprehension
1. List the four classes of sermon materials named in the chapter.
- Comprehension
2. What is the principal source of explanation, and what is a secondary source?
- Scripture
3. Define deduction and induction as forms of argument, using the sowing-and-reaping example.
- Scripture
4. Explain the 'a fortiori' argument using Jesus' words in Matthew 6:30.
- Doctrinal Clarity
5. Why does the chapter call illustrations 'the windows of sermons'?
- Comprehension
6. List the sources of illustrations given in the chapter.
- Doctrinal Clarity
7. Why does the chapter say application is what distinguishes a sermon from a lecture?
- Contrast
8. Contrast a sermon that is all explanation, all argument, or all illustration with a balanced sermon.
- Application
9. Describe the filing system suggested for gathering sermon material, and evaluate whether you use anything similar.
- Application
10. Which form of argument (deduction, testimony, analogy, etc.) do you rely on most in your own preaching, and is it well suited to your hearers?