The Just This Once Trap
The Promise
The real cost of "just this once" is not the single exception. It is the loss of the principle as a constraint, which forces every future decision into a fresh willpower battle.
How It Works
- Set the line at 100%, not 98%. A bright-line rule survives stress that a graded rule cannot. "I do not drink" is structurally easier than "I drink moderately."
- Price the exception fully. One exception costs every willpower battle that follows, because the boundary is now negotiable.
- Treat a slip as a structural failure. Recovery means re-closing the bright line, not self-recrimination over the instance.
In Practice
The 100%-vs-98% math sounds wrong until you experience both sides. At 100%, the decision is made once and the situation handles itself. At 98%, the decision recurs every time, because the boundary has become a negotiation. The small discount of the first exception is a loan against every future encounter.
Primary source: Clayton Christensen, How Will You Measure Your Life?.
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The Identity Install
Inversion
Ask how to fail first. Then refuse to do those things.
Primary source: Charles T. Munger, Poor Charlie's Almanack.
Ch 9 · The Momentum Playbook
Map Is Not the Territory
Your plan is a drawing of the terrain. Re-draw it when the terrain changes.
Primary source: Alfred Korzybski, Science and Sanity.