The Shipwreck on Main Street
In the spring of 2020, with a pandemic sealing people inside their homes and the world's supply chains seizing up like rusted gears, Ryan Holiday drove out to a vacant storefront on Main Street in Bastrop, Texas — a small town of fewer than 10,000 residents, about thirty miles southeast of Austin — and decided to open a bookstore. This was, by any reasonable measure, an insane thing to do. The publishing industry was in freefall. Indie booksellers were boarding their windows. Amazon, already the great annihilator of physical retail, was experiencing its most dominant quarter in history. And Holiday, who had made his name as a marketing wunderkind and self-described media manipulator, who had built a digital empire of newsletters and podcasts and Instagram accounts with millions of followers, who had spent a decade telling people that the future was online — this person wanted to sell paper books across a wooden counter in a rural Texas town best known for devastating wildfires and proximity to nothing in particular.
He named it the Painted Porch, after the Stoa Poikile in ancient Athens — the painted colonnade where, around 300 BC, a Phoenician merchant named Zeno of Citium began teaching philosophy after losing his entire fortune in a shipwreck. The name was not accidental. It was a thesis statement, a private joke, and a kind of dare. Holiday had spent the better part of a decade translating the Stoic philosophers — Zeno, Epictetus, Seneca, Marcus Aurelius — into books that sold by the millions, that NFL teams adopted as locker-room scripture, that Silicon Valley titans quoted in shareholder letters and Elizabeth Holmes cited on her way to prison. He had, in the most literal sense, built his life on the premise that what stands in the way becomes the way. And now he was testing it. Against the entirety of the modern economy. With a bookshop.
The couple who staked out the Painted Porch on a gloomy February morning a couple of years later, charging across the street from Maxine's Cafe the moment they spotted Holiday stepping through the front door, only to slow their approach when he didn't acknowledge them — they were not unusual. Holiday is instantly recognizable by virtue of what Texas Monthly called "a distinctive look": dark brown hair kept tight and tall, a slender build, a prominent brow that evokes, in the magazine's memorable formulation, "a Tim Burton character." He keeps his distance with the disciplined courtesy of someone who has read too many Seneca letters on the management of one's time. "Calendar anorexia," he calls it — a commitment to scheduling next to nothing, reserving the bulk of his days for writing, reading, and walking, the activities he considers the only reliable engines of the work that actually matters. He picks up his kids from school by mid-afternoon. He does not work late. He insists this is not laziness but its opposite: discipline so severe it resembles freedom.
This is the paradox at the center of Ryan Holiday's career, and of his life, and possibly of the entire modern
Stoicism movement he has done more than any single person to create: the media manipulator who preaches virtue, the college dropout who became one of the world's bestselling living philosophers, the man who wrote a book called
Ego Is the Enemy and then built a personal brand worth millions, the digital strategist who opened a brick-and-mortar bookstore, the guy who tricked the
New York Times into quoting a fake vinyl record collector and then wrote a bestselling book series on honesty and justice. It does not resolve neatly. That is the point.
By the Numbers
The Daily Stoic Empire
10M+Book copies sold across all titles
16Books published under his own name
40+Languages his books appear in
300+Weeks spent on bestseller lists (combined)
150M+Podcast downloads (Daily Stoic)
3.4MInstagram followers (@dailystoic)
1M+Daily Stoic email subscribers
The Apprenticeship of a Manipulator
Ryan Holiday grew up in Sacramento, California — "not a child of writers or really anyone involved in anything sort of like this," as he has put it. His father was a police officer. His mother was a school principal. Ordinary civil servants. The American middle. He was a voracious, indiscriminate reader — the Hardy Boys, then Nancy Drew stolen from his sister's shelf, then literally anything between two covers. The specificity of what he read mattered less than the act itself. The act was the identity. "I just fell in love with books," he has said. "I knew I wanted to do something around books. I wasn't sure if I could be a writer."
He was nineteen years old when he dropped out of college and never went back. This fact — which he has narrated with varying degrees of romantic gloss over the years — is worth lingering on, because it became both his origin myth and his operating principle. The dropout narrative in American life is always told in retrospect by people who succeeded, which makes it seductive and unreliable in equal measure. Holiday himself has acknowledged this: "That's the problem with most drop out narratives — or any narrative written in retrospect by successful people — they totally ignore how utterly unprepared most young people are for these major life decisions." He advises most people to stay in school. He just didn't take his own advice.
What he did instead was write a review of Tucker Max's website for his college newspaper and send the link to Max — the fratboy-memoirist whose I Hope They Serve Beer in Hell was, in the mid-2000s, a fixture on bestseller lists and a magnet for a certain kind of young male attention. Max posted the review on his message board. Holiday had calculated that he would. Soon he was interning at Max's media company, Rudius Media, and from there he engineered an introduction to the man who would become his most consequential mentor.
Robert Greene — the author of The 48 Laws of Power, a book that reads like Machiavelli rewritten for the hip-hop era, equal parts seduction and menace — hired Holiday as a research assistant for The 50th Law, his collaboration with the rapper 50 Cent. Greene, who was in his fifties, cerebral, methodical, and possessed of an almost monastic devotion to the accumulation and organization of knowledge, recognized in the teenage Holiday something useful: raw ambition married to an unusual capacity for self-directed education. The apprenticeship was formative in ways that Holiday has discussed at length and with evident gratitude — it shaped his writing process, his research methods (the famous notecard system, adapted from Greene, in which every passage worth remembering is transcribed by hand onto a physical index card and filed by theme), and his understanding of power as something that could be studied, systematized, and taught.
By twenty-one, Holiday was the Director of Marketing at American Apparel, the Los Angeles-based clothing company run by Dov Charney — a man whose chaotic genius and catastrophic personal conduct would eventually destroy the company and provide Holiday with an education in what happens when ego, sleeplessness, and unchecked power converge. Charney was, in Holiday's telling, a boss of extraordinary accessibility and equally extraordinary instability. He posted his phone number online for anyone to call. He slept on a cot in the shipping warehouse. By 2014, he wasn't sleeping at all — "slowly killing himself through sleep deprivation," Holiday later wrote, issuing orders that contradicted orders he had issued minutes before, "almost hell-bent on destruction." The company's implosion, which Holiday watched from the inside, became raw material for Ego Is the Enemy and Stillness Is the Key. It was the negative example that proved the Stoic thesis.
But before the Stoic turn — before Holiday became the earnest philosopher-popularizer, before the four virtues and the morning walks and the donkeys on the ranch — there was the other thing. The thing he has spent a decade both trading on and distancing himself from.
Confessions of a Fraud (His Own)
In July 2012, Ryan Holiday burned the New York Times, CBS, ABC News, Reuters, MSNBC, and the Today show — among others — by posing as a fake expert on topics he knew nothing about. He used a service called Help a Reporter Out (HARO), which connects journalists with sources, to place himself in stories as an insomniac (he wasn't), a vinyl record collector (he didn't own a turntable), a Burger King employee who'd been sneezed on (fabricated), and a corporate worker with an embarrassing office story (invented). In some cases he didn't even do it himself; he had an assistant impersonate him over the phone. "Not ONE person bothered to notice that I have a book out about media manipulation," Holiday told journalist Jim Romenesko in an email.
The stunt was calculated to promote his first book,
Trust Me, I'm Lying: Confessions of a Media Manipulator, which detailed the structural incentives and economic pressures that make online journalism uniquely vulnerable to exactly this kind of manipulation. The book was part confession, part exposé, part how-to manual — and the promotional campaign was, itself, a demonstration of the thesis. "If a random blog is half as reliable as a New York Times article that was fact checked, edited and reviewed by multiple editors, it is twice as easy to get coverage on," Holiday wrote. "So manipulators (myself included) play the volume game."
The
Times appended an editor's note. CBS updated its story. ABC deleted a section. Reuters appears to have unpublished its piece entirely. Maria Popova, the influential curator of
The Marginalian (then called
Brain Pickings), situated the book "somewhere between
The Influencing Machine,
The Filter Bubble, and
The Information Diet" — a reasonably charitable framing for a work whose author "proudly professes" to having been "paid to deceive."
This is the part of the Ryan Holiday story that his critics return to most often, and not without reason. The question it poses — whether a person who systematically lied to journalists for profit can credibly reinvent himself as a teacher of ancient virtue — is uncomfortable precisely because it does not have a clean answer. Holiday's response, when pressed, tends to be that the experience taught him what he didn't want to be. The Stoics would call this apophasis — learning through negation. You discover the good by doing the bad and recognizing the emptiness it produces. Or maybe you just move on to a more lucrative genre. The cynical reading and the sincere reading coexist, and Holiday has been shrewd enough to let them.
The Doctor, the Emperor, and the College Dropout
The story of how Holiday discovered Stoicism has become, through years of retelling on podcasts and in prologues, the kind of origin tale that functions as parable. When he was still in college, he attended a conference and approached a speaker — Dr. Drew Pinsky, the radio and television personality — to ask what he should be reading. Dr. Drew introduced him to the works of Epictetus and Marcus Aurelius. Holiday has described the encounter as revelatory: "It was just an entry point into a philosophy that I did not know existed. And that like a lot of people, I actually needed because being a person in a frustrating world is difficult."
Marcus Aurelius — Roman emperor from 161 to 180 AD, author of Meditations, a private journal never intended for publication, in which the most powerful man on Earth admonished himself daily to be humbler, kinder, more disciplined, less swayed by anger or appetite — became Holiday's lodestar. The philosopher-king whose private thoughts read, as Holiday frequently notes, "like they were written last year, not last millennium." Holiday has estimated he's read Meditations dozens of times, possibly more, each pass revealing something different because the reader is different. "It is the definitive text on self-discipline, personal ethics, humility, self-actualization and strength," he has written. He means it. The conviction is not performed.
What happened next was a slow convergence. In 2009, Holiday wrote a guest post on Tim Ferriss's blog about Stoicism — Ferriss, the author of The 4-Hour Workweek, whose podcast would later become one of the most downloaded in the world, and who would eventually call Stoicism "the ideal operating system." The post attracted the attention of a publisher who offered to turn it into a book. Holiday asked Robert Greene for advice. Greene said no — it was too early, and Holiday needed to put more time into his writing first. "Against almost every instinct, I listened," Holiday later wrote. "I passed."
The intervening years brought American Apparel, the chaos, the crisis management, the sleepless boss on the cot in the warehouse. "The stuff that
Ben Horowitz calls the hard things," as Holiday put it. But the hardship was also research. He was living the material. The impediment to action was advancing action. What stood in the way was becoming the way.
The intervening years are a blur of events — some good and some pretty bad. I would rise pretty rapidly in business. The chaos and the conflict in that company — to say nothing of the temptations and responsibilities — would shape me as a person. I learned how to manage people, I learned how to maneuver and accomplish things. Mostly, I learned how to survive — crisis after crisis after crisis.
— Ryan Holiday
Three Thousand Copies and a Locker Room
When
The Obstacle Is the Way came out in 2014, it sold roughly 3,000 copies in its first week. "It did not exceed anyone's expectations," Holiday told
The Guardian a decade later. The book's central thesis — drawn from Marcus Aurelius's line "The impediment to action advances action. What stands in the way becomes the way" — was presented not as academic philosophy but as practical psychology, illustrated through stories of Amelia Earhart, Ulysses S. Grant,
Steve Jobs, and
Theodore Roosevelt. It was Stoicism stripped of its Greek terminology and dressed in the language of performance optimization.
What happened next is the part that transforms a modest publishing success into a cultural phenomenon, and it happened in a way that no marketing strategy could have engineered. The book found its way into professional sports. Not through Holiday's PR efforts — though he was, after all, a world-class PR operative — but through the organic, word-of-mouth networks that exist inside locker rooms, where players and coaches pass along anything that might provide a competitive edge. The Miami Heat adopted it. The Seattle Seahawks. The New England Patriots, who read it before their 2015 Super Bowl victory. Sports Illustrated called it "the book on stoicism that's taking the NFL by storm."
From there it migrated to CEO reading lists. Jack Dorsey, the Twitter founder. Brad Feld, the venture capitalist. Blake Irving, the former GoDaddy chief executive. Rory McIlroy, the two-time PGA champion, said it was "the best one I've read. Ryan Holiday is brilliant. If I had read
The Obstacle Is the Way sooner, a few things might have been different."
Arnold Schwarzenegger praised it. LL Cool J hat-tipped Holiday in interviews. "I found this to be true in every country," Holiday said, "in sports that I honestly didn't even know existed."
The books that followed —
Ego Is the Enemy in 2016,
The Daily Stoic the same year,
Stillness Is the Key in 2019 (his first #1
New York Times bestseller) — each expanded the audience and refined the formula. The formula was deceptively simple: take an ancient Stoic principle, illustrate it through compressed biographical sketches of historical figures who embodied it (or failed to), write in plain, punchy prose that could be consumed on a plane or during a morning commute, and — this was the crucial addition — build an infrastructure of daily content that kept readers engaged between books. The Daily Stoic email, launched in late 2016 with a few thousand subscribers, grew to over a million. The podcast surpassed 150 million downloads. The Instagram account amassed 3.4 million followers. The YouTube channel hit 2 million subscribers.
Holiday's agent, Stephen Hanselman — a veteran publishing executive who knew Greek and Latin (a fact that astonished Holiday when Hanselman first suggested they collaborate on a daily devotional) — co-authored
The Daily Stoic and
Lives of the Stoics, providing the scholarly rigor that complemented Holiday's gift for narrative compression. Hanselman had previously published
The Daily Drucker, and he recognized the power of the daily-read format: "a process, a ritual," as Holiday later described it. Not something you read once and absorb but something you return to, page by page, day by day, until the repetition reshapes your thinking.
Stoicism is the ideal operating system.
— Tim Ferriss
The Criticism That Doesn't Quite Land (And the One That Does)
The backlash, when it came, took predictable forms. Professional philosophers objected to a college dropout with no formal training in classical languages positioning himself as the foremost interpreter of a 2,300-year-old intellectual tradition. Tom Bissell, writing in Harper's, counted Holiday among a cadre of "seemingly sincere promoters of Stoicism who seemed to miss entirely the point of Stoic thought" — finding Holiday's neo-Stoicism "too prescriptive" where the ancients were "more diagnostic." Zoe Williams, in The Guardian, articulated the class critique: "it's a bit rich, some might say nauseating, to listen to men who have more wealth than they could possibly spend pontificate about self-denial."
Holiday is visibly riled by the first criticism and characteristically equanimous about the second. On the academic objection, he notes — correctly — that Marcus Aurelius himself used the phrase "pen-and-ink philosopher" to describe people seeking understanding outside the academy, and that Epictetus was a slave, not a professor. On the Silicon Valley hypocrisy charge, he deploys a line that is either genuinely persuasive or expertly deflective, depending on your priors: "I've always been curious about why that's a bad thing. What else would you want them to be studying, other than a philosophy built around virtue? You could argue that they're missing the point, or they're picking and choosing what they take from it. But there are much darker rabbit holes that people have chosen to go down."
The criticism that lands harder — the one Holiday tends to address less directly — concerns the commodification problem. The Daily Stoic is not just a philosophical practice; it is a business with roughly 20 employees, sponsorship deals, a podcast with advertising revenue, paid courses (the Daily Stoic Leadership Challenge, the New Year New You challenge), and a bookstore that doubles as a content production facility. Holiday has built, to use his own metaphor, a "one man media company" — the phrase he borrows from Churchill's description of his exile years, when the former prime minister wrote books and articles to maintain influence. The comparison flatters, but it also clarifies: this is an enterprise. It exists at the intersection of philosophy and commerce, and the commerce is not incidental.
Holiday seems aware of the tension. He has written about declining a seven-figure deal to produce a line of supplements marketed for "calm, clarity, and resilience" under the Daily Stoic brand. "I'm not exactly opposed to supplements or vitamins," he wrote. "Nor am I opposed to making money. . . . But I have always declined to do things like Daily Stoic T-shirts and hats and cheap merch: It doesn't feel right." He quotes Seneca: "No one has condemned wisdom to poverty. The philosopher shall have considerable wealth, but it will not have been pried from any man's hands, and it will not be stained with another man's blood." Whether a daily email list of a million subscribers, monetized through sponsorships and course upsells, clears the Senecan bar is a question that reasonable people will answer differently. But it is worth noting that Holiday asks it of himself, in public, and that asking it is itself a Stoic practice — the evening review, the interrogation of motive, the refusal to let prosperity go unexamined.
The Notecard and the Algorithm
The research method is the man. Holiday has described his process so many times — on Tim Ferriss's podcast, on Shane Parrish's Knowledge Project, in blog posts and interviews and YouTube videos — that it has become a kind of brand signature, yet it remains genuinely distinctive. He reads physical books exclusively. If he encounters a research paper or article he needs, he prints it out and goes through it with a pen. He transcribes every passage worth remembering onto a physical index card — by hand, never copy-and-paste — and files the card by theme into a growing archive. The book he is working on at any given time is laid out on a cork bulletin board covered in push pins. "There are many easier and more efficient ways to do all this," he has written. "But I do it the more difficult and low-tech way on purpose."
The purpose, as Holiday understands it, is partly about tactile engagement with the material — the physical act of handwriting slows cognition and deepens encoding — and partly about resistance to the seductions of efficiency. "Copy and paste is almost a capital offense" in his system, he told Shane Parrish. The labor is the point. Every card represents a decision to deem something worth preserving, and the accumulation of thousands of such decisions over years creates a personal library of ideas that can be recombined in ways that no search algorithm would suggest.
This is the paradox of Holiday's relationship with technology: the man who built a digital content empire — podcasts, newsletters, Instagram accounts, YouTube channels, all fed by algorithms that deliver his content to millions — does his actual thinking on paper. When he tried to use ChatGPT to verify a quote about
Abraham Lincoln that he'd written on a notecard, the AI first told him it was Tolstoy speaking of Dickens, then attributed it to Lincoln's secretaries, then claimed the quote didn't exist. Only when Holiday went back through an 800-page biography, page by page, did he confirm that his handwritten notecard had been correct. "I am not a luddite," he has insisted. He used ChatGPT to plan his family's driving route through Greece. He lets his kids use it to generate ridiculous pictures and stories. But for the work that matters — for the books, for the ideas, for the thing that is supposed to last — he trusts the index card over the language model.
The Content [Flywheel](/mental-models/flywheel) and the Bookshop
Several years ago, Holiday made a decision that he describes as transformative. He was spending six figures a year on Facebook ads for Daily Stoic, hiring publicists, paying for co-op placement at airport bookstores. He stopped all of it. Not because the spending wasn't generating returns, but because "it struck me just how empty it all was. I was putting all this time and energy and money into something, which were I ever to stop, would leave barely a trace behind." He quotes F. Scott Fitzgerald, who criticized advertising as having a "constructive contribution to humanity" of "exactly minus zero."
He took the entire budget and hired a content team: a videographer, a social media manager, additional researchers. "Some people might shrug and say, 'Yeah that's called content marketing,'" Holiday has written, "but it's actually a deeper philosophical shift." The Daily Stoic podcast hit 5 million downloads a month. The YouTube channel surpassed 2 million subscribers and 63 million views. The daily newsletter went out to nearly a million inboxes, 450 million total sends and counting. The content is free. It is also, obviously, a funnel — to the books, to the courses, to the bookstore, to the speaking engagements — but Holiday insists the relationship is not primarily transactional. "Instead of using your energy and resources and effort to get attention for your stuff," he wrote, "you should be pouring that into making stuff that is worthy of attention."
The Painted Porch Bookshop, which opened its doors on historic Main Street in Bastrop, is the physical manifestation of this philosophy. It is named, again, for the stoa where Zeno taught. Its shelves are curated by Holiday. It serves as a filming location for Daily Stoic content — the setting, the "certification" in his terminology, that makes the ideas feel rooted in something tangible. It is also, improbably, a profitable business. In a nation where independent bookstores have been on a decades-long death march, Holiday built one that thrives, in a small Texas town, by leveraging the very audience that the digital content creates. The bookshop drives content; the content drives foot traffic; the foot traffic drives book sales; the book sales drive more content. It is, if you're being generous, a beautiful closed loop. If you're being less generous, it is the most literarily sophisticated marketing funnel in the history of self-help.
The Ranch, the Donkeys, and the Question of Sincerity
Holiday lives outside Austin with his wife and two sons, on a property with a small herd of cows, donkeys, and goats. This is mentioned in every author bio, on every book jacket, and the pastoral detail is clearly deliberate — it signals a life organized around values rather than velocity, a man who has chosen soil over silicon. He runs five miles every night. He journals. He reads a poem a day to his children. He has kept a One Line a Day journal for nine years, recording a single sentence about each day — the rattlesnake he killed near the garage on October 19, 2019; the day his oldest son crawled for the first time on July 2, 2017; the discovery that a newly promoted employee had been stealing from the company in February 2023; the sushi after Hamilton with his son on March 30, 2025.
The sincerity question —
does he actually believe this stuff? — is ultimately unanswerable from the outside, which may be the most Stoic observation available. But the evidence suggests, at minimum, a person who has organized his life with unusual consistency around a set of principles. He wrote an open letter to his father in 2016, begging him not to vote for
Donald Trump, grounding the argument in the values his father had taught him — immigration, decency, character. He wrote a follow-up in 2020. He was canceled from a scheduled lecture at the U.S. Naval Academy on April 14, 2025, twenty minutes before he was due to go onstage, because the Academy's leadership learned he planned to criticize the banning of 381 books from the Nimitz Library on the orders of Defense Secretary Pete Hegseth. He was asked to delete that portion of his speech. He declined. The lecture didn't happen. He published the full text in
The Free Press.
"As a maverick or as a rule breaker, I'm pretty tame," he told The Guardian in 2024. This is probably true. His daily routine — write in the morning before checking email, physical exercise, walk, reading, notecards, done by school pickup — is aggressively boring. He does not drink to excess. He does not cultivate controversy. He keeps a note on his desk that reads: "Am I being a good steward of Stoicism?" The question contains its own answer, or rather, the asking is the answer. The Stoics were not interested in arrival. They were interested in practice.
The Virtues Series and the Long Game
After the initial trilogy —
The Obstacle Is the Way,
Ego Is the Enemy,
Stillness Is the Key, now boxed and sold together as
The Way, the Enemy, and the Key for $82 — Holiday embarked on a more ambitious project: a four-book series on the four Stoic virtues, one volume per virtue.
Courage Is Calling appeared in 2021.
Discipline Is Destiny in September 2022.
Right Thing, Right Now — on justice — debuted at #1 on the
New York Times list in 2024. The wisdom volume remains forthcoming.
Each book follows the established formula: biographical compression as moral pedagogy.
Discipline Is Destiny draws on Lou Gehrig, Queen
Elizabeth II, boxer Floyd Patterson, Marcus Aurelius, and Toni Morrison, alongside cautionary tales of Napoleon, F. Scott Fitzgerald, and Babe Ruth. The chapters are short. The sentences are declarative. The historical figures are chosen for their illustrative power rather than their scholarly interest. This is philosophy as self-help — or self-help as philosophy, depending on the direction from which you approach it.
The question of whether Holiday has diluted Stoic thought or democratized it — whether he has taken something profound and made it shallow, or taken something inaccessible and made it available — maps neatly onto a much older debate about popularization itself. Every philosophical tradition that has survived across millennia has done so partly through simplification. The early Christians simplified the Greeks. The Renaissance humanists simplified the Romans. Dale Carnegie simplified William James. Holiday simplified Marcus Aurelius. Each simplification lost something and gained something else. What Holiday's simplification gains — an audience of millions, a genuine behavioral practice adopted by people who would never read Pierre Hadot's The Inner Citadel — is not nothing. What it loses is the tragic complexity, the diagnostic ambiguity, the irreducible difficulty of the original texts. Whether the trade is worth it depends on whether you believe philosophy exists to be practiced or to be understood. The Stoics, it should be noted, would have sided with Holiday on this one.
Waste no more time arguing what a good man should be. Be one.
— Marcus Aurelius, via Ryan Holiday
A Push-Pin on a Cork Board
Here is what the numbers cannot tell you: whether any of it works. Whether the person who reads a Daily Stoic email at 7:14 a.m. on a Tuesday and encounters a line from Epictetus about distinguishing what is in their control from what is not — whether that person is, in any measurable way, better equipped to handle the meeting that follows, or the diagnosis, or the divorce, or the ordinary Wednesday afternoon in which nothing happens and the silence threatens to become unbearable. Holiday does not claim certainty on this point. What he claims is repetition. "It's not something you read once and 'get,'" he has written of the Daily Stoic format. "It's a process. A ritual."
On his cork board in Bastrop, the push-pins hold index cards that will become sentences that will become chapters that will become books that will sit on the shelves of the Painted Porch and in the lockers of professional athletes and on the nightstands of CEOs and, occasionally, in the hands of a couple who drove to a small Texas town on a gloomy morning hoping to meet a man who could tell them something about how to live. The couple slowed their approach when he didn't acknowledge them, like dogs registering the subaudible hum of an electric fence.
He was probably thinking about a notecard.