The Commonplace Book: Building a Personal Library for Thinking

How I use my Commonplace Book

For many years I have kept a notebook I call my commonplace book.

Inside it live quotations, ideas, clippings from books, observations, sketches, and fragments that caught my attention at some moment and seemed worth keeping. It is not a diary. It is not a planner. It is not a system for getting things done.

It is a personal library for thinking — a place where ideas wait until they are needed, or until they connect with something else entirely.

Over time, it has become one of the most quietly valuable tools I own.

An old idea with a long lineage

The commonplace book is not a new invention. Writers, thinkers, and leaders have kept versions of it for centuries.

Marcus Aurelius kept one — which eventually became the Meditations. Montaigne's earliest essays were little more than organised extracts from his. Thomas Jefferson kept one for legal references and another for literary ones. Leonardo da Vinci described his notebook as "a collection without order, drawn from many papers, which I have copied here, hoping to arrange them later each in its place, according to the subjects of which they treat." By the seventeenth century, keeping a commonplace book was formally taught to students at Oxford.

The form is ancient because the need is perennial: a place to gather the raw material of thought before you know what you will do with it.

What a commonplace book really is

A commonplace book is a system for noticing.

Not a system for filing, or retrieving, or managing. A system for paying the kind of attention that makes ideas available when you need them — even if you had no idea at the time that you would.

Mine contains book highlights and quotations, observations from conversations and walks, business ideas in early form, design references, sketches, phrases that stopped me mid-sentence and I did not want to lose, and occasionally drawings my children made that I wanted to keep alongside the thinking.

There is no strict rule about what belongs. The rule is simple: if it is interesting, useful, or engaging — if it catches something — it belongs.

The value is not in the organisation. It is in the accumulation. Over time, patterns emerge from the material. Ideas that seemed unrelated turn out to be the same idea in different clothes. Questions that felt urgent fade. Observations you barely noticed when you wrote them down become useful years later for reasons you could not have anticipated.

Why paper still matters

Digital tools are powerful. But a physical notebook does something different from a screen, and I want to be specific about what that something is.

Writing by hand slows thinking just enough for meaning to surface. The slight friction of forming letters forces a choice about what is actually worth writing — a filter that typing at speed tends to bypass. When you leaf back through old pages, connections form unexpectedly. You notice things in proximity that were never intended to be related, and those unintended proximities are often where the most interesting thinking begins.

Screens are designed for retrieval. Paper reveals relationships. That distinction matters more than it might first appear.

A simple physical workflow

I use my notebook as an intellectual inbox.

When something strikes me — a quotation, an observation, a half-formed idea — I write it down quickly, without worrying about where it belongs or whether it is worth keeping. Speed of capture matters more than tidiness.

Once a week, I review what I have gathered. Some notes get clarified — I add context I would otherwise forget. Some get expanded into something more developed. Some get discarded, which is fine; they served their purpose by not being forgotten in the moment. Some get marked with a simple symbol to indicate a theme or type — a loose taxonomy that helps me find things without imposing a rigid structure.

The goal is for the book to feel like a working desk rather than an archive. Something alive, in use, full of material in various states of readiness.

The digital companion

Alongside the notebook, I use Apple Notes as a digital companion — and the two serve genuinely different purposes.

Apple Notes handles fast capture and searchable memory. Anything I read online, any quick thought on my phone, any audio note I dictate on the move goes there first. It is fast and accessible and good at retrieval.

The physical notebook handles reflection. When I sit with it, I am not searching for something specific. I am thinking — following associations, noticing what has accumulated, letting the pages do the slow work that screens tend to interrupt.

Once a week, I move the best of what has landed in Apple Notes into the physical book — rewriting rather than copying, which is itself a form of processing. Ideas that survive that transition tend to be the ones that actually matter.

Each medium does what it does best. Paper encourages depth and reveals patterns. Digital enables speed and recall. Ideas move between them, and that movement is itself a form of thinking.

A personal library, not a productivity tool

A commonplace book is not about efficiency. It is not a system for getting more done or managing information at scale.

It is about cultivation — the slow, non-urgent accumulation of things that matter to you, arranged by interest rather than utility, gathered over years rather than quarters.

Over time, it becomes a map of your curiosity. And from that map, original thinking quietly grows. You stop staring at blank pages, because you are surrounded by seeds — half-formed ideas, useful fragments, connections waiting to be made — that you have been planting without quite knowing it.

In a world that rewards speed, a commonplace book restores something worth protecting: a place to think slowly.

And slow thinking, sustained over time, becomes a profound advantage.