In Praise of Being Wrong
The Scene. You said it with your whole chest. The plan was sound, the logic airtight, and you laid it out for the room like a man who had already won. Then a colleague turns her laptop around, and the number on the screen is the exact opposite of the number you just promised. The silence has a texture to it. Somewhere behind your ribs, an old alarm goes off — defend, deflect, argue the margins, whatever you do, do not admit it.
The Voice. Consider the two men least obliged to ever say "my mistake," and how eagerly both said it anyway.
Marcus Aurelius ruled an empire; there was no chart anyone could slide across his table. Yet in his private notebook he set himself a standing order (in George Long's public-domain rendering): "If any man is able to convince me and show me that I do not think or act right, I will gladly change; for I seek the truth, by which no man was ever injured." The most powerful man alive treated being corrected as a favor — because the truth, he reasoned, has never once harmed the person who accepted it.
Benjamin Franklin arrived at the same humility from the opposite temperament: not an emperor's calm but a negotiator's shrewdness. Rising at the close of the Constitutional Convention in 1787, he admitted that "the older I grow, the more apt I am to doubt my own judgment, and to pay more respect to the judgment of others." Then he asked every delegate in the room to doubt themselves a little too — which is, not coincidentally, how the thing finally got signed.
The Landing. Notice what neither man treated as fatal: being wrong. What they guarded against was staying wrong out of pride. So when the number on the screen contradicts you, try the sentence almost nobody can manage in the moment — "You're right. I had that wrong." Say it cleanly, without the face-saving clause tacked on the end. You will feel your standing drop. It won't. It will climb, because you've just shown the room that your loyalty runs to the truth and not to your own ego — which means your next claim can be trusted, too. Changing your mind in public isn't the weak move. It's the rarest strong one, precisely because so few can do it.
The emperor changed his mind on purpose. You can survive changing yours by accident.