Four words from the fortieth poem: reversal is the movement of the Way. Whatever is pushed to an extreme turns into its opposite. On the point where more stops delivering more — and starts delivering less.
Most philosophies describe forces. This poem describes a shape: things move in curves, and every curve followed far enough comes back.
It is checkable in small ways. Discipline tightened past a point manufactures rebellion. An argument pressed too hard converts the persuadable into the entrenched. Control applied past a point produces exactly the chaos it was meant to prevent.
The claim is not that moderation is nice. It is that the far side of a curve is qualitatively different from the near side, and that the symptoms of being past the turn look, at first, exactly like the symptoms of not trying hard enough.
The modern version of the fortieth poem is the inverted U, and this is a place where I have to be more careful than the source material was.
The curve most often cited is Yerkes and Dodson, from 1908.3 That study was about mice, discrimination learning and electric shock, and the sweeping arousal-performance law built on it is a considerable extrapolation that has been criticized for decades. It is genuinely one of the most over-extended findings in the field, and I have seen it presented as settled physics in more places than I can count.
What is better supported is narrower and unglamorous. Unrecovered training load accumulates into a recognizable dysfunction rather than into fitness.4 And there is a body of work explicitly on non-monotonic effects — qualities that help up to a point and then stop, or reverse — across several psychological variables.5
So: the shape is a real and recurring feature of a number of systems. It is not a law of nature, and citing it as one is the sort of thing this series is supposed to avoid.
Run the audit across a few of the era’s proudest curves and the shape keeps appearing.
Connectivity, scaled: the most networked cohort on record, reporting some of the loneliest numbers.8 I should say that the cohort research here is contested — the effect sizes are argued over and the causal direction is not settled — but the pattern is at least suggestive.
Information, scaled: more available than any previous century, and a documented difficulty in deciding anything.
I am wary of the grand cultural diagnosis as a genre, my own included. The honest version is that the one-lever instruction — scale it — has no stopping condition built in, and systems without stopping conditions tend to find the far side of their curves.
Here is the problem with a shape that explains everything: it explains everything.
Any failure can be attributed to having gone past a turn. Any success can be attributed to not having reached one. Used loosely, “reversal is the movement” becomes a way of sounding wise about outcomes after they have happened, which is not a skill.
The specific misuse I want to name is what this idea does to a plateau, because I made the mistake myself while writing the essay and it is worth showing.
A plateau is not the far side of a curve. The far side is where more produces less — where the additional effort is actively costing you something. A plateau is where more produces about the same, and nothing is being damaged. Those are different situations and the difference is the whole of it. Confusing them turns this teaching into permission to leave.
And leaving is exactly what the culture would advise, because a plateau offends a premise most of us hold without examining: that effort is justified by visible movement, and that a flat line means the thing has stopped being worth doing. That premise is the one-lever thinking this poem is supposed to be arguing against. Using reversal to justify abandoning a plateau is using the idea against itself.
What a plateau actually is, in almost every practice worth having, is the place where the thing stops being a project and becomes something you do. The climbing phase is short and conspicuous. The flat stretch is where you settle in, where the skill becomes ordinary enough to be inhabited rather than pursued, and where nearly all of the time is spent. If only the ascending part counts, then almost none of your life counts — which is a strange conclusion to reach about a life.
The only version I trust is the one with a measurement attached: is the last increment paying for itself, judged over a period long enough to see? That is answerable. “Am I past my curve?” in the abstract is not.
Note — the shape explains too much
It can account for any outcome after the fact, and its most common misuse is to make leaving a plateau sound like wisdom. A flat return is not the far side of a curve: the far side is where more costs you something, and a plateau is where more changes little and harms nothing. One calls for turning. The other calls for staying.
Know roughly where you are on the curves that matter, and turn by choice rather than by collapse.
This list mixes primary texts, translations, scholarship and modern trade books, and the entries vary in how precisely they can be located. Quotations from the discourses follow Bhikkhu Sujato’s translations, freely available at SuttaCentral, cited by the standard sutta reference. Where a phrase is traditional and circulates in several renderings I say so rather than inventing a citation, and anything marked as a paraphrase is my own wording.
Things move in curves, and the far side’s early symptoms look exactly like not trying hard enough — which is why people respond to them with more.
But a flat stretch is not the far side. The far side costs you something; a plateau costs you nothing and is where most of a practice is actually lived. One is a reason to turn. The other is a place to settle in.