"The world breaks every one and afterward many are strong at the broken places. But those that will not break it kills."

— Ernest Hemingway, A Farewell to Arms (1929)

Hemingway wasn't writing about leadership but he might as well have been. Some of the senior leaders I've worked with have taken serious dents over their careers. The board that turns. The launch that lands flat. The cofounder who walks. The round that doesn't close. The dents come with the job. The question is what's there a year later: a place you went back to and got strong at, or a crater you've been quietly walking around since.

The crater is the part that doesn't make the leadership playbooks. The bad year doesn't get you on its own. The silent processing of the experience afterwards does, the quiet work of making sure that bad year can't happen again. You start showing up to meetings already half-armoured. You stop trusting the kind of decision that hurt you the last time. You add a layer of process around the work because process is what you wish you'd had then. Most of it doesn't land as a wound on the day. By the time it sets in, you've already started telling yourself a different story about it: you've learned, you've matured, you're operating at a higher level now.

That's the bit that makes it nasty. Hardening reads as wisdom from the inside. You flinch at the next pitch and call it prudence. The new hire brings an idea you don't like, so you tell yourself you've seen this movie before. You shut your door and call it focus. The mind narrates the armour as growth more often than not, and the people around you go along with it because senior leaders aren't expected to second-guess themselves out loud.

The cost shows up sideways. You don't notice the day you stopped being persuadable by a junior engineer. You notice five years later, when the people working for you have stopped bringing you the rough version of an idea because they know what you'll do with it. The day you got bored of customer calls is the same. You feel it a quarter later, when the deck you wrote turns out to be three calls behind reality. The dents you didn't tend become the things you stop being able to see. Walls have that habit. They keep the threat out and the signal out at the same rate.

The leaders who stay good at this over time do something specific about it. They didn't get there by accident. Some have a coach they actually use, not the one HR signed them up with. A few run a peer group of two or three other operators where the deal is you say the real thing about the quarter, including the bit you're embarrassed about. Others lean on a partner or a mate outside the industry who couldn't care less what your title is and wouldn't be impressed if you told them. The best ones I've watched have a practice that takes them off-stage. Riding, surfing, building, training. Doesn't matter what. The point is having a part of life where you're not on stage.

The shape underneath these is the same. They keep at least one room in their life where the armour comes off, and they go in there often enough that the dent doesn't get to set. That's the work. It looks soft from outside. It isn't. It's most of the reason these people are still doing the job at fifty in a way that resembles how they did it at thirty.

People who skip this are the senior leaders you've been managed by at some point in your career, the ones you probably promised yourself you wouldn't become. They've stopped reading the room. Most new ideas look like traps. Their calendars are locked down to keep surprises out. They're not bad people. They're people whose dents won, and the orgs around them are downstream of that win in ways few people have the standing to call out.

The team picks it up. That's the part founders and senior people miss most. You don't get to decide which of your behaviours your reports model and which they ignore. They copy the closed-off ones at the same rate as the rest, because you're the senior person and that's the working definition of culture in practice. Your defensiveness teaches them caution. Your shortened patience teaches them to close things down faster than they should. The day you refused to say "I don't know" is the day they stopped saying it too. The crater spreads outward into the org and stops being something you can fix in private.

Tending the dent is leadership work, the same line item as strategy, hiring, and board management. Skip it for long enough and the dent becomes a crater, the crater becomes the shape of the org, and the people who used to bring you their best ideas start bringing them to someone else.