How to Keep a Commonplace Book (According to One Emerson Sentence)

Emerson gave us the whole method in 33 words. Let's take it apart.

The other day I ran a search in Ember. Not a keyword search — a vibe search. I typed a question: Why should I keep a commonplace book? And my own commonplace book answered me.

One quote rose to the top, and I haven’t been able to put it down since. It’s from Ralph Waldo Emerson:

“Make your own Bible. Select and collect all those words and sentences that in all your reading have been to you like the blast of a trumpet out of Shakespeare, Seneca, Moses, John, and Paul.”

Nearly every word in this sentence is load-bearing. So let’s take it apart, phrase by phrase.

Select

Jason Fried says a building full of all the paintings in the world isn’t a museum. It’s a warehouse. What makes a museum is what’s not on the walls.

The same is true here: what makes a commonplace book yours is what’s not in it.

You don’t fill it with every idea you encounter — not even the popular ones, not even the passages ten thousand other readers have highlighted. If a line doesn’t resonate with you, it doesn’t need to be selected. Popular highlights are other people’s trumpets.

This means two people could read the same hundred books and produce two entirely different commonplace books. That difference isn’t an accident. That difference is the person. Curation is a signature.

Collect

Selecting is a judgment. Collecting is an act. You have to actually write it down.

Jack London put it bluntly: “Cheap paper is less perishable than gray matter.” A thought that turns your head but never lands anywhere is a thought you’ll spend next Tuesday trying to remember. Capture it while it’s in front of you.

All those words and sentences

Notice the units Emerson gives us: words and sentences. Not chapters. Not books.

Sometimes it’s a single word that jumps out at you. Collect it. Sometimes it’s two full paragraphs. Collect those too. The commonplace book doesn’t care about portion size. It cares about resonance. One word, sitting alone on a page, can hum for decades.

In all your reading

Not just your serious reading. Not just the books you’d admit to at a dinner party. All your reading — the novel, the psalm, the article, the field guide.

This changes how you read. Once you keep a commonplace book, you start reading like Montaigne — “rummaging about in books for sayings which please me.” Reading stops being consumption and becomes a hunt. You walk into every book with your eyes open and your pockets ready.

Like the blast of a trumpet

Here’s the qualifier. Here’s the entire selection criterion — and notice it isn’t intellectual. It’s felt.

A trumpet blast is a signal. It strikes. It turns heads. It doesn’t ask whether you’d like to be summoned; you simply find yourself standing at attention. That’s the test for what goes in the book: Did your head turn? Did it light you up?

If you have to deliberate — if you’re weighing whether a passage is important enough, or wondering whether you should find it meaningful — that’s your answer. The trumpet doesn’t mumble.

This is a huge practical relief. Every note-taker eventually drowns in the question “should I save this?” Emerson replaces the question with an instinct. Save what summons you. Leave the rest on the shelf.

Out of Shakespeare, Seneca, Moses, John, and Paul

Look at that list again. A playwright. A Stoic philosopher. A lawgiver. The apostle of love. The apostle of logic.

Emerson isn’t just naming rich reading — he’s pulling from the whole register of human wisdom. Poetry and philosophy, law and love, story and doctrine. The instruction hiding in the list is range: collect what has lasted, from wherever it has lasted.

And lasted is the key word. I don’t collect design trends in my commonplace book, even though design is my trade. I try to collect gold — the things that, if I read them fifty years from now, would still light me up and still apply. That’s my filter, imperfectly kept: if it wouldn’t still ring in 2076, it’s a trend, not a trumpet.

Make your own Bible

I saved the first four words for last.

Emerson is asking me to replace Scripture — he’s borrowing its weight to make a point. Treat the words that shape you with that kind of seriousness. Keep them close. Return to them. Let them do their work on you over time. And that instinct is one the Bible itself commends: gather what is wise wherever wisdom is found. “The wise store up knowledge” (Proverbs 10:14).

Your commonplace book won’t look like mine. It shouldn’t. It’s a museum with your name on the door, curated by your trumpet, filled with the words that summoned you — and defined, quietly, by everything you left in the warehouse.

So: read widely. Wait for the blast. When your head turns, write it down.

Select. Collect. Then — and this is the part most people skip — go back and think with what you’ve gathered.

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That last part is why I built Ember. Most tools help you store quotes; Ember helps you think with them — surfacing the right spark at the right moment and giving you a place to develop it. If you’ve got a collection gathering dust, come put it to work.

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