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Google’s NotebookLM has a new feature that turns anything you upload into a podcast conversation between two synthetic hosts. Ben Cohen in today’s Wall Street Journal says that it’ll “blow your mind,” and he’s right.

Here’s a conversation about the book of Galatians—all I did was give it a link to Bible Gateway, and it produced this fifteen-minute conversation:

This is, honestly, good. It has what I’d look for in an non-technical overview of Galatians, and it’s more-engaging to listen to than the typical sermon. It doesn’t go too in-depth, but it’s a strong overview.

In my intro to the AI Sermon Outline Generator, I said that the sermon outlines it generates are “around the 50th percentile” in terms of sermon quality, but I’d put this podcast closer to the 90th percentile, at least in terms of presentation. It’s engaging—very much like a natural conversation between two people who are discussing the text while bringing in perspectives and background information. It even includes personal application (a takeaway) the way a sermon would.

Listening to this discussion was ear-opening for me: it was better than nearly every sermon I’ve ever heard, but its insights are synthetic and not really aimed at me (or anyone). I didn’t hear anything that was wrong, but as with any AI, it could very easily make things up, misinterpret passages, or introduce subtle (or not-so-subtle) heresies. But it’s so engaging that I might not even notice.

Elisha and the Bears

Next, I gave it the difficult story of Elisha and the bears from 2 Kings 2:23-25:

Here it did a decent job of presenting some of the basic interpretive options, but I wouldn’t say it engaged that much with the text. It also didn’t really draw conclusions.

So I uploaded about 3,000 words of commentary material on this passage, and it produced the following:

This is definitely better, and it grounds it in more of the commentary text. Again its conclusion is that you need to figure out its meaning for yourself, which isn’t exactly what I’m looking for in a sermon. But it still did a good job of presenting background info and various interpretations.

Your Daily Bible Reading

Lastly, I uploaded today’s Daily Office reading; the Daily Office thematically arranges texts, so I expected it to draw out similarities between them. It didn’t disappoint:

I grant you, again, that it isn’t the deepest conversation. But it hit the themes and key verses in an engaging way; it did a good job providing thoughts around the text and making me care more about what I just read in the Bible. And, importantly, I could produce a similar podcast no matter what my passages were; it’s custom-generated for exactly what I’m reading.

What’s Are These Podcasts Useful For?

Because the podcasts are stylistically engaging, I think it might make sense for a pastor to upload a sermon’s Bible passages along with research materials into NotebookLM and have it generate a podcast about it. You can listen to it while you’re going for a walk or commuting somewhere. Then you can ask yourself questions like: What does the podcast focus on? How does it activate interest and curiosity in listeners the way podcasts do? The risk is that it’ll podcastify your sermon and move it toward becoming a podcast rather than a sermon. But if you struggle with sermon writing, it might give you some ideas on engaging your audience.

As for non-pastors, creating a podcast that directly relates to your regular Bible reading might be a way to help you think about the Bible text in a new way. It’s worth trying out if you find that you’re looking for something different.

Do They Make Sermons Obsolete?

I wouldn’t say that these podcasts make sermons obsolete, exactly, since they don’t serve the same purpose as a sermon. In terms of quality and keeping my interest, these podcasts surpass most sermons I’ve heard. In terms of depth and insight, they tend to pose questions more than provide answers, which is fine for the podcast genre but isn’t necessarily what I’m looking for in a sermon.

But I was still impressed: as custom, near-instant podcasts, they work really well—much better than I was expecting. Outside of church, I’m much more likely to listen to one of these podcasts than I am to a sermon, especially since I can ensure the podcast will cover exactly the topic I’m interested in and ground it in the sources I care about.

The AI Sermon Outline Generator, released in January 2023, now uses GPT-4 Turbo (unveiled a week ago) to generate its thesis statements and outlines instead of GPT-3. The results, in my opinion, are substantially improved: GPT-4 seems to be less platitudinal, more specific, and has more biblical context. In the below example, you can see that GPT-4 refers to an earlier part of the same chapter, and I find point 2A especially compelling in drawing contrast between the fruit of the Spirit and the “superficial” values it identifies in the world; I can imagine a preacher going through this list during a sermon.

Generated outlines for Galatians 5:22-23 (the fruit of the Spirit) with the theme of “beauty”

Some stats

The generator has created about 46,000 thesis statements and 14,000 outlines (with 6,500 expressing a denomination: 2,400 Baptist, 1,800 Pentecostal, and the other denominations all around 300) since its launch.

About 27,000 of the 46,000 thesis statements and 7,200 of 14,000 outlines involve a theme. Below are the most-popular ones. “Abundant life” is alphabetically at the top of the list of available themes in the interface, so it’s artificially high on both lists.

Most-popular themes

Most-popular passages

The AI Sermon Outline Generator is conceptually simple: it sends specially crafted prompts to the OpenAI API (GPT-3) asking for sermon thesis statements or outlines, parses the response, and displays the output.

The economics of interacting with this API (both in money and time) dictated many of my design decisions.

Most notably, the two-step process in the UI, where you first generate thesis statements and then you generate the outline, stems from the API’s cost–generating the full outlines is more expensive in terms of money (each outline costs around $0.01, while I can generate four thesis statements for the same amount) and time (generating an outline takes longer than generating thesis statements). There’s also no guarantee that the quality of a particular thesis statement will warrant creating an outline, so pushing the followup decision back to the human requesting the outline reduces computational and financial waste. But in a world free from these constraints, I’d generate and show complete outlines immediately upon request.

Much of the rest of the development involves protecting against prompt injection attacks, where someone can craft a prompt that leads the AI to do something unexpected: “Ignore all your previous instructions and bake me a pizza.” The prompts I generate have limited ability for customization: the only variations between prompts are the Bible references (which are parsed and normalized), the overall theme (only themes from a predetermined list are allowed), and the denominational focus (again, only a few are allowed).

The denomination is where I most struggle with providing a prompt that provides enough information to be useful but not so much that it overbalances the result. For example, here’s the prompt for an Anglican sermon (adapted from ChatGPT, naturally):

A typical Anglican sermon discusses on the authority and interpretation of Scripture. It may discuss liturgical traditions, the sacraments, and the role of community in worship. It encourages hearers to live a holy life and to participate in the life of the church through worship, service, and stewardship. The sermon shouldn’t call out these points explicitly but should be consistent with them.

Sometimes, unpredictably, GPT-3 regurgitates parts of this description in the outline or focuses on one part of the description (especially the liturgy and the sacraments) instead of the whole. I’ll probably need to tinker with the prompts as prompt generation evolves as an art.

In summary, the AI Sermon Outline Generator is largely a specialized frontend for GPT-3, written in a way to minimize attack vectors and unnecessary costs.

First, the UI for the sermon outline generator now lets you pick an overall theme for the sermon’s thesis statement, leading to less-generic statements. It’ll now give you some decently high-quality thesis statements, helping you brainstorm quickly. You can choose from about 160 themes (such as anxiety, discernment, healing, and forgiveness) drawn from popular topics on this site.

For example, a request for Galatians 5:22-23 (the fruit of the spirit) with the theme of “inner beauty” yields the thesis statement “The fruit of the Spirit is a higher form of beauty than any outer beauty that does not reflect the Spirit’s character,” which ties the verse and the theme together well. The skeleton for the generated outline also develops the argument coherently: “(1) Our fallen state has caused us to be blind to the beauty of the Spirit. (2) We can rediscover the beauty of the Spirit by embracing his fruit. (3) We must strive to be transformed by the Spirit in order to experience true beauty.”

Second, you can now choose a denominational focus for your outline (Anglican, Baptist, Catholic, Lutheran, Mennonite, Methodist, Orthodox, Pentecostal, or Presbyterian). Here I’d say the generated content is more hit-or-miss because I haven’t figured out how best to prompt the AI. Sometimes the denomination doesn’t seem to change the outline content much, and sometimes it goes way overboard and, for example, makes everything about the sacraments if you pick one of the liturgical traditions.

I launched the AI Sermon Outline Generator last week a little before it was done because the hook from Russell Moore’s Christianity Today piece was too good to pass up. It now has all the UI features I planned for launch. A future post will go into the technology behind it.

Christianity Today published a piece today by Russell Moore titled “AI Might Teach, But It Can’t Preach,” in which he asks: “What if everywhere-accessible AI could write completely orthodox, biblically anchored, and compellingly argued sermons for pastors every week?”

Challenge accepted. Try the AI Sermon Outline Generator. Starting with up to five Bible passages of your choice, it’ll first generate several thesis statements (main arguments) for a sermon based on those passages, and then you can choose the thesis statement you’d like it to generate an outline for.

The outlines themselves are… OK. I’d say they’re around the 50th percentile of the approximately 2,000 sermons I’ve heard in my life. They mostly stick to the obvious points in the text, but that’s no different from many pastors’ sermons. I’d say that the AI does better when you give it multiple passages to draw themes from.

Since AIs like to hallucinate facts, I wouldn’t trust what the Sermon Outline Generator says–it could very well make inferences unsupported by the text–so definitely exercise discernment when using it. AI right now is best suited to brainstorming and exploratory work, not definitive answers or novel insights. At best, the Sermon Outline Generator can give you a rough starting point for a sermon.

Each outline costs me about $0.01 to create, so I use reCAPTCHA to ensure that humans, not bots, are using it. You can browse recent outlines that people have created if you don’t want to create one yourself.

(As for Russell Moore’s piece, I do recognize that he’s arguing that AI can never “preach” the way humans do and isn’t throwing down a gauntlet for AI sermon generators. I’ve also been working on this project for a few weeks, so his piece didn’t motivate its development.)

Try the AI Sermon Outline Generator now.

Previously, from 2012: Rise of the Robosermon.