Growing reading notes with Zettelkasten — turning a book into your own words

Finish a book, think “that was good,” and a few months later you remember almost nothing. Taking notes helps, but notes organized by book never connect with what you read elsewhere. This is exactly what Zettelkasten fixes: cards are made per claim, not per book, and linked across books.

While reading: drop what snags you into the Inbox

While reading, momentum matters most. When a sentence snags you, put the page number and a few words into the Inbox. On iPhone you can scan text from a photo, so pointing the camera at the passage is faster than typing and keeps the quote accurate.

Don’t make Zettels yet. This is raw material for what Zettelkasten calls literature notes.

After finishing: one claim, one Zettel

When you finish the book (or a chapter, for long ones), go through the Inbox and ask:

Which of this book’s claims can I restate in my own words?

Only those become Zettels. The title is the claim itself, not the book’s title.

• Not “Notes on How to Take Smart Notes”
• But “Writing is not a record of thinking; it is the thinking”

Three to five Zettels per book is plenty. If you have more than ten, either the claims are too granular or they aren’t in your words yet, so merge some.

Inside each Zettel, keep three kinds of Notes separate:

1. Quote: verbatim, with page number
2. Summary: your paraphrase
3. Your take: agreement, disagreement, questions, connections to your own experience

Never mixing quotes with your own thinking is the single most important rule; it’s what stops you wondering, months later, whose opinion this was.

Connect across books

This is where Zettelkasten earns its keep. Link the new Zettel to Zettels from other books.

• Says the same thing in different words
• Flatly disagrees
• One is an example or counterexample of the other

Besides Zettel links, ZettelkastenNote has note links that connect individual Notes — better for “this quote from author A is a rebuttal of that quote from author B.”

Each time you link, add one line in the source Note about why: “→ opposing view”, “→ real-world example.” That line is the explanation to your future self.

What about the book’s metadata?

Make one Zettel per book as the “book card” holding author, year and when you read it. Each claim card links once to its book card. You can always trace a claim back to its source, while the claim itself stays independent and free to connect elsewhere.

Keep tags to broad fields — reading, psychology, work. You’ll be tempted to tag by book title; a link to the book card does that job without cluttering your tags.

What pays off months later

After half a year, you’ll catch yourself mid-book thinking “this is the same claim I read before.” The card already exists; one link joins two books inside your head.

In the Mac app’s link graph, clusters of densely linked cards appear across books. Those clusters are what you actually care about. On-device AI points out cards that are similar but not yet linked, so you catch combinations you’d have missed.

The goal of reading notes isn’t to remember the book. It’s to turn its claims into parts of your own thinking that you can recombine. Zettelkasten is the box where you keep and connect those parts.