Reading Without Notes Is Entertainment Not Learning
Reading without writing notes may feel intellectually stimulating, but it produces almost no durable understanding. The feeling of learning and actual learning are dangerously different things.
"The principle is that you must not fool yourself, and you are the easiest person to fool." Richard Feynman
The mere-exposure effect is the silent enemy of readers. When you reread a passage, its familiarity registers as comprehension. You feel smarter. But research by Karpicke, Roediger, and others has shown repeatedly that rereading and underlining are "almost completely useless" for actual retention. The majority of students choose these methods anyway, even after being taught they do not work. The illusion is that powerful.
What does work is retrieval practice actively testing yourself on what you have read. Sonke Ahrens frames smart note-taking as exactly this: "Taking literature notes is a form of deliberate practice as it gives us feedback on our understanding or lack of it, while the effort to put into our own words the gist of something is at the same time the best approach to understanding what we read." When you attempt to rephrase an argument in your own words, the gaps in your understanding become immediately visible. This discomfort is the price of actual learning.
Holden Karnofsky's "learning by writing" method makes this operational. He organizes learning around writing rather than reading: forming a premature hypothesis, defending it in writing, finding weaknesses, then revising. "I try to continually focus my reading on the goal of forming a bottom-line view, rather than just gathering information." This approach transforms reading from passive consumption into active investigation. The writing forces you to decide what you actually believe, which is the prerequisite for retaining anything at all.
Takeaway: If you read a book and cannot explain its core argument in your own words without looking, you were entertained, not educated always read with a pen in hand.
See also: Writing Is Thinking Made Visible | Spaced Repetition Turns Reading Into Remembering | Syntopical Reading Is How You Build Understanding