The position was up 4.2%. Not life-changing, but solid — the kind of trade that quietly validates your whole system. The setup had played out almost textbook. Then the bid softened slightly, and instead of banking it, I told myself it had more in it. That thought cost me 2.8% on the wrong side of zero.
The mental gymnastics were impressive, in hindsight. I'd moved from "this is a good trade" to "this is a great trade" without a single piece of new information. The chart hadn't changed its story. I'd changed mine. Mark Douglas calls this the moment traders abandon the probabilities that got them in and start negotiating with the market — as if the market is listening.
The root cause was not greed in the cartoon sense. It was a specific decision: I removed my profit target because the position felt good. Feeling good is not an edge. The original target was set during calm pre-market analysis. The revision was made while the position was open and dopamine was doing the maths. Those are not equivalent conditions.
The rule that would have prevented it is blunt: profit targets set before market open do not get revised upward once the trade is live. That's it. Not a philosophy — a mechanical constraint. Systems exist precisely to override the in-trade brain, which is compromised by position bias the moment size goes on. Douglas makes this point repeatedly in Trading in the Zone — consistency comes from executing within a framework, not from freestyle decision-making while exposed. The broader mechanics of profit targets in trading exist for exactly this reason. And understanding position management frameworks as a discipline — not a suggestion — is what separates systematic traders from the ones journalling their feelings at midnight.
The trade journal entry that night had one line under "lesson": set it and respect it. Four years later, that line is still the most expensive thing I've ever written for free.
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