"We are what we repeatedly do. Excellence, then, is not an act, but a habit."
It is probably the most shared line in the entire self-improvement world, and it is almost always credited to Aristotle. He never wrote it. The sentence belongs to the historian Will Durant, summarising Aristotle's argument in his 1926 book The Story of Philosophy. That correction matters less than you might think, though, because Durant summarised him well. The idea underneath is genuinely Aristotle's, it sits at the centre of the Nicomachean Ethics, and it is one of the few self-improvement claims that has survived two thousand years of testing.
This article covers both halves: who really said "we are what we repeatedly do", and what the idea asks of you once you take it seriously.
"We are what we repeatedly do. Excellence, then, is not an act, but a habit."
Will Durant, summarising Aristotle
Who really said it: Will Durant, not Aristotle
Durant coined the phrase while compressing Aristotle's ethics for a general audience. The passage he was compressing comes from the Nicomachean Ethics, where Aristotle argues that the virtues are not innate gifts. We acquire them the way we acquire crafts, by doing the thing:
"Virtues are formed in man by his doing the actions." (Aristotle, Nicomachean Ethics)
So when the line gets stamped on posters with Aristotle's name, the attribution is wrong but the philosophy is right. Durant did what good summarisers do: he made the idea portable. If you quote it, credit Durant summarising Aristotle. Almost nobody does, which means you will look unusually careful when you do.
What "we are what we repeatedly do" actually means
Aristotle's claim is stronger than "habits are useful". His claim is that your character is your habits. Courage, honesty, generosity, patience: these are not traits you have in some inner vault, waiting for the right occasion. They exist only in repetition. A person who tells the truth once is not honest. A person who tells the truth so consistently that lying has become difficult for them is.
Which means the flattering story we tell ourselves, that we are defined by our intentions and our best moments, has it backwards. You are defined by your Tuesdays. Excellence, in Aristotle's sense (arete), is not occasional brilliance. It is what your ordinary, repeated behaviour adds up to, for better or worse. The Stanford Encyclopedia entry on Aristotle's ethics goes deep on this if you want the scholarly version.
Aristotle at a glance
| Born | 384 BCE, Stagira, Greece |
| Key work | Nicomachean Ethics |
| Big idea | Virtues are habits formed through repeated actions |
| Legacy | Western philosophy, ethics, and most of the modern habit literature |
For Aristotle, building a virtue had three ingredients. Consistent action: repeating the behaviour until it becomes automatic. Intentionality: choosing your habits deliberately rather than absorbing whatever your environment installs. And alignment: making sure the habits point at virtues you actually endorse, because repetition will build your character either way. That last clause is the uncomfortable one. The mechanism has no opinion about what it automates.
Putting it into practice
Four steps, in the order that works:
1. Define your virtues
Name what excellence means for you specifically. Courage? Discipline? Kindness? Vague aspirations cannot be repeated; named virtues can. Aristotle's conception of excellence was always concrete: excellence at something, toward someone.
2. Start small and stay consistent
One page of reading. Five minutes of meditation. One small fear confronted. Aristotle's mechanism runs on repetition, not intensity, so the dose that matters is the one you will actually repeat tomorrow. Small and daily beats heroic and occasional, every time.
3. Automate what you can
Reduce the daily willpower bill. Lay the workout clothes out the night before. Make the distraction harder to reach than the work. A well-built environment repeats your chosen action for you on the days you don't feel like choosing it.
4. Review and adjust
Every so often, ask two questions of your routines: is this habit moving me toward a virtue I named, and which habit needs replacing? Repetition without review is how people get very good at things they never meant to become.
Breaking the habits that run the other way
The same mechanism that builds virtue builds vice, which is why breaking bad habits is half of Aristotle's programme. The sequence: notice the habit honestly (this step gets skipped more than any other), then replace rather than merely remove, a five-minute task sprint where the procrastination used to live, and then give the new pattern time. Character changed slowly in 350 BCE and it changes slowly now. The research on habit formation agrees with Aristotle on the timescale: longer than you want, shorter than you fear.
Epictetus, four centuries after Aristotle, compressed the whole idea into one line that deserves to be as famous as Durant's:
"Capability is confirmed and grows in its corresponding actions, walking by walking, and running by running." (Epictetus)
Where this leaves you
The sentence on the poster is Durant's. The idea is Aristotle's. The application is yours, and it is less glamorous than the quote suggests: pick the virtues, shrink the actions, repeat them on the days that don't feel meaningful. Especially on those days. What you repeatedly do is quietly answering the question of who you are, whether you are steering it or not.
Frequently Asked Questions (FAQs)
Who originally said, "We are what we repeatedly do"?
Will Durant, summarizing Aristotle's teachings from the Nicomachean Ethics.
What does Aristotle mean by excellence?
Excellence (arete) is the highest state of virtue achievable through habitual practice rather than isolated acts.
Why are habits important according to Aristotle?
Habits shape who we become. Consistent practice of virtues fosters personal growth and true happiness.
What practical methods help form good habits?
Start small, maintain consistency, align habits with clear virtues, automate routines, and regularly reflect on your progress.
The whole argument of this piece is that reading changes nothing and repetition changes everything. The 7-Day Stoic Challenge is built on exactly that premise: one exercise a day for a week, free. It is the rep, not the announcement.