Integrity is not what you say in the boardroom. It is what you do when no one is watching.

When I was a young lieutenant in Germany, I had a platoon of about 41 Soldiers. We patrolled the East and West German border, and when we weren’t out at the border outposts, we worked on maintaining our equipment. Ten vehicles in the platoon, tanks and personnel carriers and mortars, most of them beaten up in Vietnam, shipped to Germany, patched up, and handed to us to patch up again. Every evening we’d finish in the motor pool and form up to march back to the barracks.

My platoon sergeant was a man everyone called Sergeant Mac, a big, intimidating veteran of multiple tours in Vietnam. The Soldiers did what he said, and they did it quickly, because they understood there would be consequences if they didn’t. One evening, not long after I arrived, he handed off the job of marching the platoon back to another sergeant. Then he turned to me and said, “Sir, let me see your fingernails.”

I remember thinking it was strange. Were we doing a hygiene inspection now? But he wasn’t checking for cleanliness. He was checking whether my hands were dirty, whether I had spent the day working alongside my Soldiers or simply directing it from a clipboard. That day, my hands weren’t dirty enough. “Okay, sir,” he said. “We got more work to do.” We climbed back up on the tank and changed the generator together, and he supervised every step, because he believed I had to know every task my Soldiers knew if I was going to lead them well.

What Sergeant Mac Was Really Testing

Sergeant Mac was not interested in my rank that evening. He was checking whether the version of me giving orders in the daylight was the same version willing to get his hands dirty when no one outside the platoon was watching. That is the Mirror Test in its simplest form, a question you never answer out loud, only in the moment you look at your own reflection and ask whether the leader you present to your team is the leader you really are.

Do the Right Thing, one of my Big 6 Leadership Principles®, rests on a hard truth most leaders would rather not say out loud. Leadership gets defined in the quiet moments, not the public ones, when the decision is hard, the stakes are unclear, and no one is watching to record what you chose. Sergeant Mac understood that decades before I had the language for it, and he built it into me with grease and a generator instead of a lecture.

The Three Questions

I have used three decision tests ever since that night to check myself against the mirror.

• Does this align with what I claim to value?
• Would I be proud to explain this decision publicly, to the people who trust me?
• Am I choosing what is right, or only what is easy?

The third question is the one that catches most of us, because right and easy frequently look identical from a distance, and the gap between them only shows up once you’re standing close enough to feel the discomfort of the harder choice.

Why the Mirror Test Gets Harder, Not Easier

Most leaders assume integrity gets simpler as they gain seniority, since they finally have the authority to act on their values without needing anyone’s permission. The opposite tends to happen. The higher you rise, the fewer people are positioned to challenge you, and the more your own habits become the unspoken standard for everyone watching you. Sergeant Mac could check a lieutenant’s fingernails without a second thought. Try to picture anyone on a senior executive’s staff doing the same thing.

This is where the test stops being about a single hard decision and starts being about pattern. Moral courage is doing the right thing once, under pressure, with everyone watching. Character is what shows up when you do it consistently, in the small moments no one will ever ask you about. Culture is what leaders allow, what they tolerate, and what they reinforce, whether they intend to or not. A team does not learn its real standards from the policy manual. It learns them by watching what the leader does when the policy manual is not in the room.

The Practice That Holds

The leaders who pass the Mirror Test consistently share one practice that looks almost too simple to matter. Before a difficult decision, they pause long enough to ask the three questions honestly, not as a formality but as a genuine check against the answer they were already leaning toward. They ground the decision in their values before they ground it in convenience, and then they own whatever the decision costs them, publicly if it comes to that, the same way I had to own the small embarrassment of being caught with clean hands.

None of us pass this test perfectly, and Sergeant Mac never expected me to. What he expected was that I would notice when I had failed it, and go change the generator. That is the whole of Do the Right Thing in practice, looking honestly at what the mirror shows you and going to fix it, not getting it right the first time.

I’d love to hear about a moment someone held you accountable to a standard you hadn’t fully lived up to yet. Leave a comment below and let’s talk about it.

Enjoy the journey!