Blood pressure under 120/80. Eight hours of sleep. Ten thousand steps.
Useful numbers. Dangerous masters.
Every one of them describes an average person. None of them describes you.
We invented these numbers because unaided judgement is noisy, biased and full of excuses. A guideline stops a clinician from guessing from scratch every time. A parenting rule stops exhaustion from making the call. A relationship pattern stops you from overreacting to one bad week. Averages exist for a reason. Dismissing them is usually vanity dressed up as personalisation.
Rules matter. They just aren’t verdicts.
A guideline tells a clinician where the evidence points — not what’s true about the specific patient in the room.
A parenting script tells a mother what usually helps a child that age — not what her particular son, at his particular stage of capacity, actually needs.
A relationship pattern tells a couple what most people in their situation do — not what’s actually happening between the two of them this week.
The mistake isn’t using the rule. It’s mistaking the rule for the verdict.
Once a number has a name, a study or an expert behind it, it starts to feel like the case is closed. It isn’t. The average earns the right to ask the first question. It never gets the last word.
Life isn’t an argument to be proved. It’s a hypothesis to be tested — and the average is only ever the starting hypothesis.
Track votes, not verdicts.
A rule tells you where to start looking. It cannot tell you what you are looking at.
