"Just This Once." Why You Can't Stop Saying Yes (and How It Leads To Burnout)
- 3 days ago
- 4 min read
Updated: 4 hours ago
Think about the last time you said yes to something you didn't really have room for. Maybe it was an extra project, or a favor, or a meeting that ate the one open afternoon you'd been guarding all week. Whatever it was, you probably didn't agonize over it. It was just one thing. You could handle one thing.
That's how it usually goes, right? Nobody decides to burn out. There's no single moment where you sit down and choose exhaustion. It happens through a long string of small yeses that each seemed completely reasonable at the time. One more project. One skipped workout because of a deadline. One email answered at 9pm because it couldn't wait. None of them feel like much on their own, and that's exactly what makes them so easy to keep saying yes to.
Harvard professor Clayton Christensen spent his career studying business, and one idea he kept coming back to was something he called marginal cost thinking. The short version: when we're deciding whether to do something, we tend to weigh it against nothing. Just this one thing, on its own, in a vacuum. Measured that way, almost anything looks affordable. He was mostly writing about companies and personal ethics, but the same math explains a lot about how capable people end up completely mentally fried.
The math that always looks fine in the moment
Here's the catch. When you weigh each decision on its own, you leave out the part that actually matters in the grand scheme, which is everything else you've already said yes to.
That one skipped workout doesn't stay one skipped workout. By the end of the year, it's forty of them. "Urgent" stops meaning anything, because everything's urgent now. The energy you used to have at dinner runs out somewhere around three in the afternoon. None of that shows up when you're looking at a single decision by itself, which is the whole reason the pattern is so hard to catch. Each individual yes really is small. It's the pile of them that gets you.
And you never see the pile, because you never see it all at once. You see one request, sitting there looking harmless, asking for maybe thirty minutes, maybe an hour of your evening. What you don't see behind it is every other hour you've already handed over this month on the same reasoning. The decision feels new each time, but it almost never is.
Why this is so easy to miss if you're good at your job
If you've built any kind of reputation around being dependable, the person people count on to handle things, then you've gotten good at taking on that "one more thing." It's probably helped you get as far as you have.
But it also means you're the last person likely to notice when it's becoming too much. When someone asks if you can take something on, the honest answer is usually yes, because you can. You've proven that a hundred times. Of course you can do it, but did you ask yourself if you should?
There's also a reason it feels good to say yes, or at least better than the alternative. Yes avoids the discomfort of letting someone down. It keeps your reputation intact and it settles that voice of worry about being seen as someone who couldn't keep up. So every yes comes with its own little reward attached, which makes the next one even easier.
So burnout doesn't show up as one dramatic moment of breakdown. It builds out of a hundred small ones that make perfect sense, until you look up one day and barely recognize your own life. You're experiencing things that you haven't been able to fix on your own, assuming you've even noticed the issue. Chronic fatigue, your irritability toward everyone, feeling like you should be feeling good since you're getting stuff done but you're absolutely not okay. You can't trace it back to any single decision point, because it was never about a single choice. It was "just this once," said enough times to become the way you live.
Where Does the Line Actually Sit?
Ready for the uncomfortable part? A boundary you're willing to cross "just this once" isn't really working as a boundary. It's more of a strong suggestion, and it gets renegotiated the second something feels important enough.
And something always feels important enough. That's the trap inside the trap. The exceptions aren't careless. They're the compelling ones, the deadline that really does matter, the person who really does need you, the opportunity that won't come around again. Nobody breaks their own rules for trivial reasons. You break them for good ones, which is why you'll never run out of good ones.
This is why holding a line all the time is strangely easier than holding it most of the time. Leave room for exceptions and you end up having the same argument with yourself over and over, and there's always a good case for making this one the exception. Decide once, though, and the argument's finished. You're not reopening it every time work gets loud.
That doesn't mean becoming a rigid person who color-codes every hour and never bends. It means picking the small handful of things that aren't up for negotiation, the ones tied to your health, your relationships, your sense of who you are when you're not producing anything, and then actually treating them that way.
A question worth taking into the next "just this once"
Next time you're about to make an exception, the question isn't whether you can pull it off. You can, I'm certain you can, but that was never really the issue. The better question is what it costs when you're looking at it in isolation and start seeing it as part of the pattern that's been building.
There's no clear answer to that, and there isn't meant to be. The point is just to catch yourself in the act, to notice the math you're running before you finish running it. Because the healthy choice that costs you more today may very well be the one that costs you far less down the road.
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Written by Hunter Cook, MSML, LPC/MHSP
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