Short answer: you can have a conversation shaped by a book's ideas, voice and preoccupations. You cannot talk to its author, and you are not getting a lookup of the text. It's genuinely useful for bringing a specific personal problem to a body of thought, and genuinely bad at anything requiring precise textual accuracy.
I built one of these, so read this as interested rather than neutral. I've tried to be straight about the failures because you'll find them within about ten minutes anyway.
What's actually happening
When you ask Meditations a question, a language model is generating a response informed by everything it absorbed about Marcus Aurelius, Stoicism and that text during training, shaped by instructions about voice and posture.
It is not retrieving the book and searching it. It is not the author. It has no memory of Marcus's life and no access to his intentions. What it has is a very detailed statistical impression of how that book thinks and sounds — which turns out to be enough for some purposes and nowhere near enough for others.
Worth saying plainly: the conversation is an interpretation. A good one, hopefully. But when a book has been read in radically different ways for two thousand years, any single voice answering as that book has quietly picked a reading.
What it's genuinely good at
Bringing a specific problem to a body of thought. This is the real use. "My brother borrowed money and won't pay it back and I'm furious" is a question no index can answer and no summary addresses. A conversation can.
Getting past the intimidation. A great many people own Meditations and have never opened it. Asking it something is a lower-friction way in than page one, and it tends to send people to the actual text rather than away from it.
Following up. The thing a book can't do is answer your second question. Most of the value in any conversation is in turn three, when you say "yes, but what about—".
Finding out whether you want to read it. Ten minutes of conversation tells you more about whether Nietzsche is for you than any review.
Hearing an unfamiliar position. Asking The Prince about a workplace problem gets you a reply most of your friends wouldn't give, which is occasionally exactly what's needed.
Where it fails
It can be confidently wrong. Language models produce fluent, plausible text whether or not the underlying claim is accurate. If it attributes a line, check it. This is not a solved problem and anyone telling you otherwise is selling something.
It flattens disagreement. Where scholars have argued for centuries — whether The Prince is satire, how to read Plato's ideal city — a conversational reply tends to pick one and sound certain. We try to flag contested ground rather than smooth it over, but the format pulls toward false confidence.
It isn't the author, and shouldn't pretend to be. Ours will tell you so if you ask. If a tool lets you believe you're speaking to Marcus Aurelius, that's a design failure, not a feature.
It's no substitute for reading. A conversation gives you the ideas without the experience of the prose. For Meditations that's a real loss; for Crime and Punishment it's most of the book.
It has no idea who you are. It doesn't know your history, your circumstances or your risk. For anything touching health, law, money or faith, it's the wrong instrument — talk to someone qualified.
How to ask well
The difference between a useless reply and a good one is almost entirely in the question.
- Bring a problem, not a topic. "Explain Stoicism" returns an encyclopedia entry. "I can't stop replaying an argument from three days ago" returns something the book has a position on.
- Be specific and be real. Vagueness in, vagueness out.
- Argue back. Disagreement is where these conversations get good. Tell it the answer doesn't work for your situation and say why.
- Ask what it can't help with. A decent implementation will tell you.
Talk to this book
Message the consciousness of Meditations
Ask Marcus Aurelius's Meditations a question and hear it answer in its own voice — no uploads, no summaries.
- How do I stop caring what people think of me?
- What would you tell me about anger?
- I'm afraid of dying. What should I do?
When to just read the book
If you want the prose, read the book. If it's short — the Enchiridion is forty pages, the Tao Te Ching eighty — read the book. If you're studying it, read the book, in a named translation, and check every quotation.
The version of this that's worth building sends people to the text more often than it replaces it. That was the intent, anyway. Whether it works is something you can only find out by trying it.