The culture has one piece of advice about quitting, and it's 'don't.' Never give up. Push through. Grind it out. The advice is repeated so often, and attached to so many success stories, that it's become almost unquestionable. And it's half right, which is the dangerous kind of advice, because the other half quietly destroys people who follow it past the point where it stops applying.
Here's the half nobody puts on a poster: some ideas deserve to be abandoned. Not because the founder was weak, or didn't want it enough, but because the idea was wrong, and no amount of grit turns a wrong idea into a right one. Persistence applied to a dead idea isn't courage. It's a slow, dignified way of wasting years that a faster pivot would have saved, and it's celebrated right up until it isn't.
The trouble is that from the inside, a hard idea worth finishing and a dead idea worth burying feel almost identical. Both are painful. Both involve pushing against resistance. Both feature long stretches where nothing works and you have to keep going on faith. The 'never give up' advice can't tell them apart, which is exactly why it's dangerous — it gives you a reason to keep going that applies equally to the thing you should quit.
So the real skill isn't persistence and it isn't quitting. It's telling the two situations apart, and that requires a kind of honesty that grit actually works against. The more invested you are, the more your judgment bends toward continuing, because admitting the idea is dead means admitting the investment is lost. Grit, the very thing celebrated as a virtue, is also the thing that blinds you to the moment it should end.
There's a clean test, and it's uncomfortable to apply. Ask what's actually keeping the idea alive. If it's evidence — real signs that the thing is working, even faintly, even slowly — that's conviction, and conviction is worth pushing on. But if the only thing keeping it alive is how much you've already put in, that's not conviction. That's sunk cost wearing conviction's clothes, and sunk cost is the most expensive emotion in business.
The distinction is sharp once you name it. Conviction looks forward: I believe this will work because of what I'm seeing. Sunk cost looks backward: I can't stop now because of what I've spent. The first is a reason to continue. The second is a reason dressed as one, and it feels exactly as compelling, which is the whole problem. People grind for years on the strength of a feeling that's really just the size of the hole they've dug.
And here's what the persistence narrative leaves out entirely: quitting the wrong thing is not a failure, it's a release. Every month you spend on a dead idea is a month you're not spending on a live one. The cost of holding on isn't just the wasted effort; it's the opportunity, the better thing you didn't start because you were busy not giving up on the worse thing. Quitting well frees you to find what actually works.
So I'd keep the advice about persistence, but bracket it hard. Persist on the strength of evidence, not on the strength of how much you've already lost. When you catch yourself continuing only because stopping would mean admitting the spend was wasted, that's the signal — not to grind harder, but to let go, take the lesson, and point the same stubbornness at something that's actually showing signs of life.