Scan time: 2-3 minutes / Read time: 3-5 minutes
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Hey rebel ideapreneurs 🦸♂️🦸♀️
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🙋♂️ Sam’s lessons that don’t stick
Sam is an operations manager who writes a newsletter on the side,
about simple systems for small-business owners.
Every week he learns something about his readers.
Long issues get fewer replies.
Tuesday mornings beat Friday nights.
Two weeks later, he has forgotten both lessons,
and he makes the same mistakes again.
He forgets his ideas for new newsletter posts too.
One comes to him in the shower, and he has forgotten it by lunch.
🧩 His struggle:
He’s sure the important ones will stick, so he never writes anything down, and he keeps losing his lessons and his ideas.
On his drive to work, a podcast tells the true story of a man
who made costly mistakes too,
and still became worth $18 billion.
Once, that man was so broke he borrowed four thousand dollars from his dad.
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📓 The man who wrote down what hurt
Ray Dalio started investing when he was twelve.
He carried golf bags for golfers, and they gave him tips on stocks to buy.
In 1975, after business school, he started a company from his two-bedroom apartment in New York.
It was called Bridgewater, and it invested money for other people.
By the early 1980s, Ray was sure of something.
American banks had lent developing countries far more money than those countries could ever pay back.
He expected the unpaid loans to cause a crash, and he said so in public.
He bet that a crash was coming, with his money and his clients’.
In August 1982, Mexico could not pay its loans.
It looked like Ray was right.
But the stock market went up instead of down, and it kept going up.
He lost so much money, his own and his clients’, that he nearly had to close his company.
He let almost everybody go.
They felt like family to him, and he was heartbroken.
He had to borrow four thousand dollars from his dad to pay his family’s bills.
Then he changed the question he asked himself.
He stopped telling himself “I’m right,”
and started asking, “How do I know I’m right?”
From then on, every painful mistake became a puzzle for him.
What would he do differently next time?
When he found the answer, he wrote it down as a rule, so he would remember it.
The list grew, year after year.
Get this — because his rules were written down so clearly,
he could turn them into instructions a computer could follow.
The computers made decisions right alongside him.
Bridgewater grew into the biggest hedge fund in the world.
A hedge fund is a company that invests money for big clients.
Today it looks after more than $100 billion.
Ray still made mistakes.
He just rarely made the same one twice, because every lesson was written down.
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🔥 The recipe
➡️ Write the Rule Down
Ray turned every painful mistake into a written rule, so he wouldn’t have to learn it again.
What Ray did has a name: Write the Rule Down.
When something goes wrong, you work out what you’d do differently.
Then you write it down as a rule.
For Ray, the mistake was betting on a crash that never came.
What he changed was the question he asked himself: “How do I know I’m right?”
Ray didn’t trust himself to remember.
He trusted the list.
Ray’s list was the start of a second brain:
one place outside our heads where we keep everything we don’t want to lose.
His held his rules.
Ours can hold much more:
the lessons from our mistakes, our ideas for next month’s posts, our plans for the quarter,
and the notes from a book we liked.
Ray had to turn his rules into instructions for a computer.
Today, our AI sidekick can open our notes wherever we keep them (on our computer, on the web, or in the cloud),
and read them just as we wrote them.
We keep the second brain in one place, and our AI sidekick reads it whenever we ask.
It can find an idea we saved three months ago, in seconds.
It can turn a one-line idea into a first draft.
It can check our next decision against our own rules.
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🛠️ Sam’s turn
Remember Sam, the newsletter writer who keeps losing his lessons and his ideas?
That evening, he runs the prompt at the bottom of this email,
and tells it everything on his mind: the mistakes, the ideas, the plans.
His AI sidekick puts it plainly:
Put all of it in one file, sorted into rules, ideas, and plans,
and add to it every time you learn a lesson or get an idea, so nothing lives only in your memory.
His AI sidekick saves the file where Sam keeps his notes.
It has nine rules, fourteen ideas for issues, and his plan for the next month.
Before his next issue, he asks his AI sidekick to check the draft against that file.
It points to one rule: long issues get fewer replies.
So he cuts the draft in half.
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🌅 Ten weeks later
Sam’s file has twenty-three rules and forty ideas in it now.
He hasn’t stared at a blank page once.
When he’s stuck for a topic, he asks his AI sidekick to pick three ideas from the file.
Last Tuesday, his draft ran long again,
and his AI sidekick checked it against his rules before he sent it.
His replies have doubled, from about six an issue to twelve.
Sam didn’t need a better memory.
He needed one place to keep what he already had.
Write the rule down, while it still hurts.
That’s it, my fellow trailblazers!
Yours ‘helping you build an AI sidekick that works and makes money while you enjoy life’ Vijay Peduru 🦸♂️
P.S. [PLACEHOLDER — product line, e.g. “Want the full second brain setup, with the rules file, the capture habit, and the AI that checks it for you? It’s here →” · link · price]
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🏄♀️ The prompt
The prompt below sorts everything on your mind into one file, your second brain, with your rules, your ideas, and your plans.
You just empty your head into it.
🧰 What you’ll need
Everything on your mind, the more the better
- The mistakes you keep making, your ideas, your plans.
- If your AI sidekick can see your notes, it reads them itself. If not, upload them, or just say it out loud.
- e.g. my long issue got two replies, I sent on a Friday again, an idea on checklists for new hires, a paid guide in MarchA decision you’re about to make
- e.g. what to write in next Tuesday’s issueWhere you keep notes now
- e.g. a notes app on my phone, and nowhere else
🚀 How to run it
Open your AI sidekick, ChatGPT, Claude, or whichever one you use. The best is one that can already see your notes, wherever you keep them (on your computer, on the web, or in the cloud).
If it can’t see your notes, upload them, or swap the three examples, the text inside the curly brackets, for your own. Then run it.
🧪 Want to test it first? Run it without changing anything, and it will use the examples.
CONTEXT:
- Use my own material first. If you can see my notes and sent issues, wherever they are stored, read them there. If I uploaded a file, read that. Pull my real mistakes, ideas, and plans from them instead of the examples below.
- If you know how I write, use my voice. Otherwise, write in a clear, warm, no-jargon voice — first-person, plain words, no startup-speak.
- If you know who my readers are, write for them. Otherwise assume small-business owners who want simple systems.
- If I have replaced the examples, use only mine. If an example is still there, fill it in from what you already know about me, and mark it as your assumption. If you don't know anything about me yet, use the example exactly as written.
=============== INPUTS — edit these, or just run as is ===============
Everything on my mind: mistakes I keep making, ideas, and plans:
{e.g. my long issue got two replies, I sent on a Friday again, an idea on checklists for new hires, a paid guide in March}
A decision I am about to make:
{e.g. what to write in next Tuesday's issue}
Where I keep notes now:
{e.g. a notes app on my phone, and nowhere else}
======================== END OF INPUTS ========================
Outputs:
1. My rules — turn each mistake into one rule, written as "When X, I do Y, because Z." One line each, plain words.
2. My ideas — every idea I mentioned, one line each, with a working title.
3. My plans — what I want to do, with a rough date for each.
4. My second brain file — all three sections in one file titled "My Second Brain", with today's date. If you can save files, save it as my-second-brain.md where I keep my notes. If you can't, give it to me in one block I can save myself.
5. The check — apply my rules to the decision I am about to make, and tell me which rule I am most likely to break.
6. The habit — one sentence on when I add to the file (right after something goes wrong, or the moment an idea shows up) and where the file lives, based on where I keep notes now.
Then tell me the ONE idea in the file I should work on first, and why.