The False Certainty of the Sick — Why Cognitive Psychotherapy Teaches Doubting

A Sentence from the Year 1933

Russell watched Hitler's rise and searched for the mechanism behind the catastrophe. He found it not in the malice of the many, but in an asymmetry of self-certainty:

“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.”

Bertrand Russell: The Triumph of Stupidity. 1933.¹

The sentence has a rarely quoted continuation that only completes it: even those of the intelligent who believe they know a remedy are too solitary to band together with other intelligent people from whom they differ on minor points. Stupidity organizes itself; intelligence frays in doubt. Russell was aiming at mass politics. But what he described is the fundamental signature of human judgment about oneself — and thus the true subject of cognitive psychotherapy.

The Late Confirmation — The Dunning-Kruger Effect

Sixty-six years later, in 1999, the American psychologists Justin Kruger and David Dunning supplied the empirical confirmation of Russell's observation — without ever mentioning him.² They had test subjects solve tasks in logic, grammar, and humor and then assess their own performance. The result is known today as the Dunning-Kruger effect: those who scored worst overestimated themselves the most. Participants in the lowest quartile of performance imagined themselves slightly above average — though they were among the weakest.

The explanation is a disquieting fact: the ability to perform a task and the ability to judge it spring from the same source. Whoever cannot think logically therefore lacks the very tool needed to recognize his own error in thinking. Incompetence robs the incompetent of the very organ by which they might notice it. Dunning and Kruger called this a deficit in metacognition² — in that thinking about one's own thinking which tests whether a thought holds.

Charles Darwin had already sensed it in 1871, when he noted that “ignorance more frequently begets confidence than does knowledge.”³ Darwin formulated the intimation, Russell distilled it into an aphorism, Dunning and Kruger measured it in the laboratory. Three approaches - poetic, philosophical, statistical - led to one and the same finding.

What Science Has Doubted Ever Since

We will not conceal that the effect is itself disputed — that would be exactly the kind of complacency this text writes against. As early as 2002, Joachim Krueger and Ross Mueller showed that part of the pattern is a statistical artifact: the mixture of nearly everyone's tendency to consider themselves above average and the simple regression to the mean.⁴ In 2020, Gilles Gignac and Marcin Zajenkowski sharpened the objection and declared the effect to be “mostly” a measurement artifact.⁵ The debate remains unsettled to this day; every refutation is met with a rejoinder.

The famous curve with its “peak of stupidity” and “valley of despair,” which adorns every cursory article on the subject, is an invention of the internet — it does not appear in the original 1999 paper. Whoever displays it has seen the meme, not read the source.

For psychotherapy, however, the statistical quarrel is secondary. It concerns the question of how cleanly the effect can be measured across entire populations. What interests the psychotherapist is not the curve but the phenomenon he observes in every consultation: people who are certain of their false assumptions with a fervor that stands in inverse proportion to their truth.

Illness as Miscalibration

Here the turn takes place that separates this text from the thousand droll musings about one's foolish fellow men. For the Dunning-Kruger effect is not a finding about other people — the dolts, the stubborn, the know-it-alls. It is the epistemological description of psychological suffering itself.

Consider what people actually come to psychotherapy with. The anxiety sufferer is absolutely certain that the bridge will collapse, that the heart will fail, that the embarrassment will end fatally. The depressive is equally certain that he is worthless, that everything remains meaningless, that it will never get better. This certainty is the symptom. It is not the event that makes one ill - the Stoic Epictetus, on whom cognitive psychotherapy draws, already knew this -, but the judgment with which we invest it, and the absoluteness with which we cling to it.

This allows mental health to be defined more precisely than the misleading talk of “positive thinking” can manage. Health is calibration: the correspondence between how certain I am and what reality actually warrants. Both poles are diseased — the delusional certainty of the one who overrates himself as much as the paralyzing certainty of the one who despises himself. The healthy person does not feel less; he takes his thoughts for what they are: hypotheses about the world, not the world itself. It is precisely this distinction - a thought is not a fact - that is the lever on which cognitive psychotherapy acts.

Socrates, the Healthiest of Men

If the certainty of the sick is the one extreme, where lies the other? Not, as one might suppose, in self-underestimation — that is the statistically shaky half-truth of the Dunning-Kruger effect. The healthy opposite of foolish certainty is not despondency, but a cultivated disposition for which there has been a model for two and a half thousand years: Socrates, who was wiser than the others solely because he knew of his own not-knowing.⁶

This is the maximal contrast: not stupidity against intelligence, but blind certainty against knowing doubt. The cardinal and philosopher Nicholas of Cusa gave this disposition its name in the fifteenth century — “docta ignorantia,” learned ignorance. Montaigne made it his motto: “Que sais-je?” — What do I know? It is no accident that the brightest minds in history recognized their intelligence precisely in their readiness to doubt.

And here lies the reason the title says “doubting” and not “doubt.” Doubt as a state would be merely another paralysis. Doubting as an activity, however, is the continual reconciliation of one's inner picture of the world with a reality that does not stand still — questioning as a habit. Health is not the absence of convictions, but the learned skill of testing them rather than being at their mercy. It is precisely this skill that cognitive psychotherapy installs.

The Blind Spot — Why No One Pulls Himself Out of the Swamp by His Own Hair

This brings us to the cruelest insight of the whole story. If incompetence robs the incompetent of the organ by which they might recognize it, then this holds in heightened form for one's own error in thinking. Every person has a blind spot for his own thinking errors: the same distorted thinking that produces the anxiety or the depression also sits behind the eyes with which he looks at himself. One looks straight through the distortion and takes it for clear sight.

Popular wisdom has a perfect image for this: no one pulls himself out of the swamp by his own hair. Baron Münchhausen, the famous liar, claimed exactly that — and that is precisely how one recognizes the lie. Whoever is stuck in the swamp of his own thinking lacks the fixed point outside himself from which he could pull himself out. “Give me a place to stand, and I will move the world,” Archimedes is said to have remarked. The sick person cannot give himself this fixed point; by definition it lies outside his blind spot.

Two things follow from this, and both are decisive for understanding psychotherapy. First, an external, professional psychotherapeutic guidance is required — not because a person is too stupid, but because no one can illuminate his own blind spot from within it. The psychotherapist is the borrowed external standpoint, the second-order observer's perspective that the patient cannot yet adopt himself, until he has learned to internalize it. Second, this explains why mere self-help reading so often fails: one reads along, confirming one's own prejudice, because one reads it from within oneself. Two shelf-feet of self-help books are no substitute for the cognitive psychotherapist, who helps overcome the blind spot for one's automated thinking errors.

This also shows why the written form, in interaction with real psychotherapists, is as effective as it is when practiced in Written Cognitive Psychotherapy at the Anxiety Clinic on Lake Zurich⁷. A spoken thought fades away; a written one remains standing. On paper, the thought steps out of the head for the first time and lays itself down before its author, where it can - at last from outside - be examined and, with the help of the cognitive psychotherapist, tested and corrected. The written word is the foreign fixed point in tangible form.

Turning the Mirror Around

But now the trap lurks into which almost everyone steps who has heard of the Dunning-Kruger effect. One uses it as a weapon against others: “Typical Dunning-Kruger,” one says of the arrogant colleague, the bloviating politician, the uncle with the infallible gut feelings. Whoever does this commits, in that very moment, the effect he claims to recognize — the self-assured misjudgment born of half-understood knowledge.

The New Testament has known the image for two thousand years: one sees the speck in one's brother's eye and fails to notice the beam in one's own. The only honest addressee of the Dunning-Kruger effect is oneself. And this is at the same time the fundamental psychotherapeutic movement as such: only one's own thoughts can be corrected. One can be outraged at the thinking errors of others; one can change only one's own.

This is why this text does not invite the reader to laugh at the stupid. It turns the mirror around. The uncomfortable question is not which of the others is a victim of his certainties, but: where am I, right now, too sure of myself?

The Institutional Dunning-Kruger

There is one place where the self-assurance of the incompetent comes especially dear: the consulting room. For the effect does not spare the healers. If the ability to judge something stems from the same source as the ability to do it, then it is precisely the most incompetent psychotherapists who are most firmly convinced of the efficacy of their work.

This explains an observation many make but few voice: that some come out of the psychotherapy practice sicker than they went in. The brain researcher Ernst Pöppel estimates that only about one tenth of people truly think for themselves;⁸ if that ratio also holds for the profession, then only a minority of psychotherapists truly master the real craft - thinking about thinking - in fact. The rest are not, say, unsettled; in keeping with the effect, they are the most satisfied with themselves. A system that weans its practitioners off independent thinking rather than teaching it thereby runs a quiet negative selection: it binds the self-assured incompetents and drives away the doubting competent. Aaron Beck, the founder of the method, warned shortly before his death how many call themselves cognitive behavioral therapists without mastering even the most elementary foundations⁹ — the professional variant of foolish certainty.

The iatrogenic consequence is bitter: the convinced but incompetent psychotherapist infects the patient with his certainty. “You are chronically ill; this will take years” becomes a self-fulfilling prophecy. Whoever is meant to teach doubting but knows none himself ends by multiplying the very illness he claims to cure. Why the most effective psychotherapy nonetheless helps the fewest is set out in detail elsewhere.¹⁰

How One Teaches Doubting — And Why It Is Pure Thinking

So how does one install a skill the patient, by definition, does not yet possess? Not by instruction. A good psychotherapist does not tell the anxiety sufferer that his fear is unfounded — he would have known that long ago and still not believed it. He asks. Aaron Beck called this approach the Socratic method: “The cognitive therapist functions as a fellow experimenter, a guide, an educator using a Socratic style.”¹¹ Through patient, targeted questioning, the psychotherapist leads the patient to discover his own error in thinking for himself. The psychotherapist does not doubt for the patient; the patient learns to doubt, himself, at the right place. Socrates returns as a clinical instrument.

And here the discerning reader must take the final, unaccustomed step, for it sets a widespread misunderstanding back on its feet. What is exposed and newly rehearsed in this work is not behavior. It is thinking. The patient does not train to cross the bridge more bravely; he corrects the judgment that the bridge is dangerous. Once that judgment is recalibrated, he crosses the bridge without anyone having had to practice the crossing with him — just as one does not move the shadow but the body, and the shadow follows of its own accord.

From this follows the conclusion the field is reluctant to draw: for this mechanism of action, cognitive behavioral therapy is dispensable. The psychotherapist-directed behavioral exercises that make up its name set in where the actual work is already done. What heals is the correction of thinking — that is, cognitive psychotherapy. Behavior is the consequence, not the cause; one need not drill the consequence separately. Whoever wishes to read up on the difference between the two methods in detail will find it in our comparison of the two methods.¹²

There remains the question that stands behind the entire text and that each can answer only for himself. The stupid, Russell wrote, are sure of their cause, the intelligent full of doubt. The gift the wise have never envied the stupid, and that the sick lack, is one and the same: the ability to doubt one's own thinking. Cognitive psychotherapy provides no certainty. It teaches the rational, logically grounded doubting that identifies and heals errors of cognition.

Frequently Asked Questions

What Is the Dunning-Kruger Effect?

The observation described in 1999 by Justin Kruger and David Dunning that the least competent overestimate themselves the most. The cause is a deficit in metacognition: whoever cannot perform a feat of thinking therefore lacks the ability to recognize his own error in thinking.

What Does the Dunning-Kruger Effect Have to Do with Psychotherapy?

A great deal. Psychological suffering is a form of blind certainty: the anxiety sufferer is certain of the catastrophe, the depressive of his worthlessness. Cognitive psychotherapy treats precisely this miscalibration between conviction and reality.

Is Doubting Therefore Healthy?

Probing doubting is. Health is not the absence of convictions, but the learned skill of treating one's own thoughts as hypotheses and testing them against reality rather than being at their mercy. Socrates’ knowledge of his own not-knowing is the model.

Why Is a Self-Help Book Not Enough?

Because everyone has a blind spot for his own thinking errors: the same distorted thinking sits behind the eyes with which he looks at himself. No one pulls himself out of the swamp by his own hair. It takes a fixed point outside — professional psychotherapeutic guidance.

Is This Cognitive Psychotherapy or Cognitive Behavioral Therapy?

Purely cognitive psychotherapy. Only thinking is corrected; the changed behavior follows of its own accord, without psychotherapist-directed behavioral exercises. For this mechanism of action, the behavioral component of cognitive behavioral therapy is dispensable.

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