The Quiet Power of Learning Something You’ll Never Use
Roughly 70 percent of what the average adult studies in a formal course is never applied on the job. That figure comes from training and development research that has been replicated often enough to be taken seriously, and it should unsettle anyone who believes education exists to be cashed in. If the statistic is close to true, then most of us spend years acquiring skills that quietly expire, unconsulted, like tools in a drawer we never open. The obvious conclusion is that we are wasting our time. The less obvious conclusion — the one I have come to believe after fifteen years of watching people learn — is that the unused knowledge is often doing more for us than the knowledge we actually deploy.
I want to tell you about two people I have taught, because their contrast explains something that a definition cannot.
Two Learners, Two Very Different Returns
The first was a student I’ll call Marcus, who enrolled in a statistics course because his employer required it. He was a project coordinator, sharp and pragmatic, and he approached the material the way you approach a toll booth: pay, pass through, forget. He asked, in the first session, whether he would ever need regression analysis in his actual job. I said probably not. He nodded, satisfied, and spent the semester doing exactly enough to pass.
The second was a woman named Priya, who signed up for a beginner’s astronomy elective with no professional motive whatsoever. She worked in insurance claims. She had no intention of becoming an astronomer, and she never used a single formula from that class in her career. By every utilitarian measure, the course was a dead end.
Four years later, Marcus was still a project coordinator. Priya had been promoted twice. I am not going to pretend the astronomy class caused the promotions — that would be dishonest and a little absurd. But when I asked her what changed, she said something I have repeated to myself many times since. She said the class taught her how to be comfortable being wrong.
The Skill That Transfers When the Content Doesn’t
That is the thing about unused knowledge. The content evaporates; the posture remains.
When Priya learned how astronomers estimate the distance to a star, she learned to reason from incomplete evidence, to hold a conclusion loosely, and to revise it when better data arrived. None of that is astronomy. All of it is management. She was not applying the subject matter; she was applying the manner of thinking the subject matter had demanded of her.
Marcus, by contrast, learned statistics as a transaction. He memorized procedures without ever letting them reshape how he thought. The irony is that the knowledge he refused to internalize was the knowledge he could have used. The knowledge Priya never used was the knowledge that changed her.
This is not a motivational slogan. It is a description of how transfer actually works. Skills transfer sideways, not forward. You rarely use the thing itself; you use the habits it left behind.
Why We Keep Measuring the Wrong Thing
I understand the pressure to justify learning economically. Tuition is expensive, time is scarce, and “it might be useful someday” is a weak argument against a mortgage. So we ask: what is the return on this course, this degree, this hour?
The question is reasonable and the answer is almost always wrong, because we measure the return on the content rather than the capacities the content builds.
Consider something as mundane as learning to identify wild mushrooms. If you take a weekend workshop, you will probably never forage seriously. You may never eat a single mushroom you find. But you will spend two days learning to distinguish similar-looking things by paying attention to details most people overlook — gills, spore prints, the color of the stem base. You will learn that confidence is not evidence. You will learn to check twice. Those habits do not stay in the forest.
I once spent an afternoon on a web site about tailoring, of all things, purely out of idle curiosity. I have no intention of sewing a garment. But the way a tailor thinks about fit — measuring, adjusting, measuring again — quietly reorganized how I edit my own writing. I now cut a paragraph the way a tailor takes in a seam: incrementally, checking the drape each time, never all at once.
That is the quiet power I am describing. It never announces itself. It simply shows up, years later, in a meeting or a sentence or a decision, wearing a different costume.
The Comparison Nobody Makes
Here is the comparison I find most useful, because it cuts against everything we are taught about efficiency.
Think of two ways to spend a hundred hours. In the first, you study something directly tied to your job and you use it immediately. The return is fast, visible, and real. In the second, you study something you will never use and you internalize it slowly. The return is slow, invisible, and also real.
Most people choose the first and feel virtuous. But the first kind of learning depreciates quickly, because job-specific skills are tied to a job, and jobs change. The second kind of learning compounds, because habits of thought are portable. They travel with you into industries that did not exist when you learned them.
The trap is that the first kind of learning feels productive and the second kind feels indulgent. That feeling is a measurement error, and it is costing us more than we realize.
What I Do Differently Now
I have changed how I choose what to learn, and the change is small but consequential.
I no longer ask whether I will use something. I ask what it will make me better at noticing. A course in music theory did not make me a musician; it made me a better listener, and listening is most of editing. A semester of constitutional law did not make me a lawyer; it made me slower to accept a confident claim, which is most of thinking.
I also stopped treating unused knowledge as a debt. The hours I spent learning things I never applied were not wasted. They were an investment in a version of myself I could not yet see, paid out in installments I did not recognize until they arrived.
And I became suspicious of the phrase “practical skills.” Practical for what? For the job you have now, in the economy you have now, with the tools you have now? That is a very short horizon for a very long life.
The Case for Deliberate Irrelevance
If you take one thing from this, let it be this: deliberately learn something you will never use.
Not because it might come in handy. Not because it will look good on a résumé. But because the useful part of learning is rarely the part you can name in advance. The subject is just the vehicle. The destination is a slightly different mind.
Marcus got exactly what he paid for. He learned statistics well enough to pass and forgot it cleanly, which is the most efficient possible outcome and also the emptiest. Priya got something she did not pay for: a way of holding uncertainty without panic, which no syllabus promised her and no exam tested.
The statistic at the top of this article — that most of what we learn goes unused — is usually read as an indictment of education. I read it as a description of how education actually works. The content is disposable. The change is not.
So pick the course that has no obvious payoff. Take the class that no one can justify. Learn the thing you will never use, and then watch, over the following decade, how often it shows up anyway, wearing the face of something else entirely.
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