You become what you repeat

Distilling Books - Number 31

Mar 04, 2026

Welcome to Mental Garden. The following letter is part of our “Distilling Books” collection, in which we extract the most revealing ideas from literature. For the complete library, click here.

🏷️ Categories: Habits, Life lessons, Continuous improvement, Behavior.

File:Aristotle Altemps Inv8575.jpg — Bust of Aristotle (URL)

Aristotle is one of the most influential thinkers in history.

A student of Plato. Tutor to the great Alexander the Great. Founder of the renowned Lyceum of Athens. He studied ethics, logic, biology, politics, metaphysics… But among all his reflections, there was one that I find more intriguing than the rest.

How is a person’s character formed?

Not how to fake it.
Not how to wish for it.
How to become it.

That question gave rise to a work called Nicomachean Ethics. Nicomachus was his son, and the text was addressed to him. It wasn’t an abstract book of theories: it was a practical guide on how to live well and become a good person, dedicated to his son.

In Book II, a revealing statement appears.

“We acquire the virtues by practicing them. We become builders by building, and lyre-players by playing the lyre; likewise, by practicing justice we become just.” — Aristotle, Nicomachean Ethics (Book II)

We aren’t born as something. We become something by practicing it.

First we act. Then we transform.

And understanding this changes everything.

The origin of who we are

“Habits arise from actions.” — Aristotle, Nicomachean Ethics (Book II)

This sentence seems simple. It isn’t.

We become what we repeat, but repeating something you hate is useless. You’ll quit. You can force yourself for a few days to work out, eat better, or write… but if your environment and your identity don’t change, you’ll quit.

And when you quit, you’ll reinforce the old belief: “I’m not consistent,” “I’m not athletic…”

That’s the usual mistake.

If you look closely, most people focus on outcome-based goals: “I want to lose weight,” “I want to eat healthy,” or “I want to write a book.” But that’s abstract. To achieve it, we need to change something deeper—something many people ignore.

Our identity.

Your environment, the content you consume, and the people around you define you.

Artists value the expression of their inner world and introspection.
Digital nomads value global experiences and freedom.
Athletes value consistency to improve and a healthy diet.

Each group normalizes certain behaviors. And what’s normal doesn’t create friction.

If you’ve gone years without exercising, your life is designed for someone who “isn’t athletic.” Nothing seems to suggest that working out is important.
If you’ve been training for years, your life is organized around it. Skipping a day means getting a message from a friend asking why you didn’t come.

Your environment adapts to what you repeat. And what you repeat strengthens your identity.

So the key question arises: How do we change our identity?

Aristotle answered it more than two thousand years ago. You don’t change by thinking differently. You change by acting differently. Notice the difference.

It’s not “I want to lose weight.”
It’s “I train three times a week.”

It’s not “I want to eat healthy.”
It’s “I choose real food every day.”

It’s not “I want to write a book.”
It’s “I write every day, even if it’s just 300 words.”

And this applies to everything. Your identity is shaped by your environment and maintained because it doesn’t create friction. You’ve seen it: if you’ve spent years without training, your life is built for someone who isn’t athletic. If you’ve spent years going out for runs, your life is designed around that.

I went through the same thing with writing.

Let me tell you how everything changed—and how you can apply it to your case.

Writers are those who write

I never thought of myself as a “writer.”

Nothing in my environment pushed me to write. No one would have said I was someone who wrote. But I started publishing regularly—three articles a week for more than a year. And everything changed.

Over time, I met other writers.
Over time, I prioritized reading over other habits.
Over time, I started protecting my writing hours.
Over time, “being a writer” stopped being my aspiration and became my description.

I simply was.

I became one because I acted like one long enough.

In this sense, what you repeat creates the habits that end up defining your character and identity. That’s exactly what Aristotle was teaching his son:

Building makes us builders.
Playing the lyre makes us lyre-players.
Practicing justice makes us just.
We don’t change overnight. We change by accumulation.
Read one more day → you’re a reader.
Train again → you’re someone active.
Practice with your guitar → you’re a musician.

A single action doesn’t transform your life. But as actions accumulate, the habit forms and, little by little, your way of seeing the world, your priorities, the people around you, your decisions… everything changes. Day to day it seems like nothing changes, but when you remember where you started and turn your head to look back… everything will have changed.

Start small, repeat actions aligned with the identity you want, and keep them going.

We become what we repeat.

If nothing changes in what you do,
nothing will change in who you are.

Want to learn more? Here are 3 related ideas to go deeper:

✍️ Your turn: If you tracked in a notebook all your habits and daily actions, what identity are you building with what you do today?
💭 Quote of the day: “We acquire virtues by practicing them, just as with any other skill, art, or trade.” — Aristotle, Nicomachean Ethics (Book II)