How to Read a Book Slowly: A Simple Method for Remembering What You Read

You finish a book you really enjoyed. You underlined passages, nodded along, maybe even told a friend about it. A month later someone asks what it was about, and you can only remember the title and a vague feeling that it was good.

This happens to almost every reader. It’s not a sign of a poor memory. It’s simply how memory works, unless we read in a way that works with it.

Why we forget what we read

In the 1880s, the German psychologist Hermann Ebbinghaus tested his own memory by learning lists of nonsense syllables and checking how much he remembered over time. He found that memory fades quickly at first and then more slowly, a pattern now called the forgetting curve.

Real books are more meaningful than nonsense syllables, so we forget them less sharply. But the basic lesson holds: reading something once, passively, is a weak way to remember it.

Highlighting and re-reading feel productive, but studies of learning suggest they’re among the less effective ways to remember. What works better is actively retrieving ideas from memory and connecting them to what we already know.

The power of recall

In a well-known 2006 study, psychologists Henry Roediger and Jeffrey Karpicke asked students to learn short prose passages. Some re-read the passage; others read it once and then tried to recall it. A week later, the students who had practised recalling remembered considerably more, even though they had spent less time looking at the text.

This is called the testing effect, or retrieval practice. Every time you pull an idea out of memory, you strengthen it.

A simple method for reading slowly

You don’t need to do this for every novel you read for fun. But for books you really want to remember, it helps.

Before you read: skim and ask

Spend five minutes looking at the contents page, the introduction and the conclusion. The philosopher Mortimer Adler, in his classic How to Read a Book, called this “inspectional reading”. Ask yourself: what is this book trying to say, and what do I want from it?

While you read: one line per chapter

At the end of each chapter, close the book and write one or two sentences in your own words: what was the main idea? Don’t copy the author’s words. Putting it in your own language is what makes it stick.

Mark sparingly

Instead of highlighting everything, mark only passages that genuinely surprise you, change your mind or that you’d want to quote. Fewer marks are easier to return to.

After you finish: the one-page summary

Within a day or two, without looking at the book, write a one-page summary. What were the three most important ideas? What do you disagree with? What will you do differently? Then check the book to fill gaps.

Revisit, briefly

A week later, and again a month later, re-read your one-page summary (not the whole book). Each short visit pushes the forgetting curve further out.

Keep a commonplace book

For centuries, readers kept a commonplace book, a single notebook where they copied favourite quotations, ideas and reflections from everything they read. Thinkers from the Renaissance onwards used them.

A modern version is simple: one notebook or digital file with a page for each book, containing your summary, a few quotes and your own thoughts. Over the years, it becomes a personal library of the ideas that shaped you.

Read fewer books, better

There’s a common pressure to read more: 50 books a year, 100 books a year. But a book that changes how you think is worth more than ten that pass through without a trace. Reading slowly is not falling behind. It’s reading for real.

Frequently asked questions

Should I take notes on paper or digitally?

Either works. Some research suggests handwriting may help people process ideas more deeply, though findings are mixed. The most important thing is to write in your own words.

What about audiobooks?

Audiobooks are great. The same principles apply: pause after a chapter, recall the main idea and jot it down.

Isn’t this too slow?

It adds perhaps 10 to 15 minutes per book chapter by chapter, plus 20 minutes for the summary. For a book you truly want to remember, that’s a small price.

A small step for today

Think of the last non-fiction book you read. Without looking, write down three ideas you remember from it. However many you can recall, that list is now stronger in your memory than it was a minute ago. That’s retrieval practice in action.

Sources and further reading

• Ebbinghaus, H. (1885). Memory: A Contribution to Experimental Psychology.
• Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
• Dunlosky, J., et al. (2013). Improving students’ learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58.
• Adler, M. J., & Van Doren, C. (1972). How to Read a Book. Simon & Schuster.