The Existentialists
Kierkegaard, Sartre, and Camus relocated anxiety, despair, freedom, and meaning from life's edge cases to its structure — the school that actually became a psychotherapy.
Medically reviewed · Last updated June 2026 · 13 min read
Existentialism is the only philosophy in this series that actually became a psychotherapy — with founders, textbooks, training institutes, and a lecture in every residency curriculum.
Hume and Nietzsche illuminate psychiatry from outside; the existentialists were annexed by it. Logotherapy, Daseinsanalyse, Rollo May, Yalom's four givens, half of ACT's conceptual skeleton — all of it is downstream of the three figures gathered here. The banner itself requires one honest caveat: it is a flag its own members kept refusing. Kierkegaard died a century before the word existed and wrote as a Christian who would have been appalled by Sartre; Camus flatly denied being an existentialist and, in the Myth of Sisyphus, accused Kierkegaard's leap of faith of being "philosophical suicide"; only Sartre wore the label willingly. (Heidegger, the banner's missing fourth pole, supplied much of the vocabulary — anxiety, being-toward-death, the anonymous "they" — and reached the clinic through Binswanger and Boss; the user of these essays already has Nietzsche, the movement's other ancestor, on the shelf.) What unites them is not answers but a shared relocation of the questions: from essence to existence, from humanity in general to the single individual, and from viewing anxiety, death, freedom, and meaning as life's edge cases to viewing them as its structure. Psychiatry inherited exactly those questions, because they are the ones patients actually bring.
The system in brief
Kierkegaard (1813–1855) is the fountainhead. His pseudonymous books map inner life with a precision psychiatry would not match for a century. The Concept of Anxiety (1844) separates fear, which has an object, from anxiety, which has none — anxiety is freedom apprehending its own possibility, "the dizziness of freedom" — and insists that the task is not to eliminate it but to be "educated by possibility": whoever learns to be anxious in the right way, he says, has learned the ultimate. The Sickness unto Death (1849) does the same for despair, defined not as sadness but as a misrelation of the self to itself, and arranged in a taxonomy: the despair that does not know it is despair (the busy, well-adjusted kind), the despair of not willing to be oneself, the despair of defiantly willing to be oneself. His life-stages — aesthetic, ethical, religious — describe the collapse of a life built on stimulation and avoidance ("the rotation of crops," the aesthete's strategy of perpetual novelty) and its repair through commitment, the choosing of oneself. His epistemology is clinical to the core: "truth is subjectivity" — truth that is not appropriated, lived, changes nothing — and so the truth-teller must work indirectly, maieutically, since direct instruction bounces off a self in despair. And against the anesthetic of conformity he set his most famous warning: the crowd is untruth.
Sartre (1905–1980) systematized the radical center: existence precedes essence. We are not instances of a nature; we are "condemned to be free," a perpetual negotiation between facticity (what is the case about us — body, past, situation) and transcendence (what we make of it). The signature pathology is bad faith — the lie told to oneself, with oneself as both deceiver and deceived — typically by collapsing the negotiation in one direction: claiming to be a fixed essence ("I am like this; I cannot change") or claiming weightless freedom (denying one's facticity altogether). His waiter, performing waiterhood, is the type-specimen. Being and Nothingness adds the Look: the self is partly constituted under other people's gaze, and shame is the primordial experience of being seen and fixed. His Sketch for a Theory of the Emotions (1939) proposes that emotion is not something that merely happens to us but a strategy — a "magical transformation of the world" attempted when instrumental paths are blocked. He even sketched an "existential psychoanalysis" — the decipherment of a person's fundamental project — and practiced it at scale in vast psychobiographies of Baudelaire, Genet, and Flaubert. His ethics is compressed in one line from 1946: a coward makes himself cowardly, a hero makes himself heroic, and either can stop.
Camus (1913–1960) begins where psychiatry's emergencies begin. The first sentence of The Myth of Sisyphus (1942): there is only one truly serious philosophical problem, and that is suicide. The absurd is his name for the confrontation between the human demand for meaning and the universe's silence — and his entire work is the argument that the absurd licenses neither physical suicide nor "philosophical suicide" (the leap into consoling systems), but a third thing: revolt, lucidity without appeal, living more rather than less. "One must imagine Sisyphus happy." The Plague (1947) translates the stance into medicine: Dr. Rieux fights an epidemic he cannot defeat, on the strength of nothing grander than what he calls common decency — doing his job. The Rebel (1951) finds in revolt the ground of solidarity — "I rebel, therefore we exist" — and The Fall (1956) is the great literary study of corrosive, performative self-accusation. Camus is the existentialist of measure: against nihilism and against utopian cures, for limits, sunlight, and the body.
Three case histories
All three come with charts. Kierkegaard's is the heaviest: a father who, as a starving shepherd boy, had cursed God on a Jutland heath and spent his life convinced the family was damned for it; a mother and five of seven siblings dead by Søren's early twenties; a household conviction that the children would not outlive thirty-three (Søren was genuinely surprised to). He called his melancholy his "thorn in the flesh" and, in Either/Or, "the most faithful mistress I have known." The famous journal entry of 1836 is the textbook portrait of smiling depression: he has just come from a party where he was the life and soul, wit streaming, everyone laughing — and he wanted to shoot himself. He broke his engagement to Regine Olsen in 1841, deliberately playing the scoundrel to free her, convinced his melancholy could not be shared — the wound under the entire authorship. The Corsair affair of 1846 — a satirical paper's sustained mockery campaign that made him a street joke in Copenhagen — is an early case study in coordinated public ridicule and its sequelae of withdrawal. He collapsed in the street in October 1855, mid-polemic against the state church, and died at forty-two of something still debated (spinal disease and acute ascending paralysis have both been argued).
Sartre's chart is pharmacological. In February 1935, to study imagination, he had a psychiatrist friend inject him with mescaline at Sainte-Anne — and got a bad trip with a long tail: months of intrusive imagery in which crabs and lobsters followed him about. He retained insight throughout — he knew the crustaceans weren't there — which makes the episode a clean case of pseudo-hallucination with preserved reality testing, complicated by a real depressive fear of going chronically mad; he took the problem, wonderfully, to a young psychiatrist named Jacques Lacan. Nausea (1938) — Roquentin's vertiginous encounter with sheer contingency in a chestnut root — remains one of literature's best renderings of derealization–depersonalization, philosophy and psychopathology genuinely indistinguishable on the page. And his later work ran on speed: he wrote the Critique of Dialectical Reason on heroic daily doses of corydrane (amphetamine plus aspirin, then legal in France), a documented stimulant dependence that bought productivity and billed his health.
Camus's chart begins with a death sentence. Tuberculosis at seventeen ended his goalkeeping (he later said everything he knew most surely about morality he owed to football) and installed, for life, the consciousness of early death that the philosophy of the absurd merely formalizes. Add the facticity he transcended: a father killed at the Marne before Albert turned one; a silent, partially deaf, illiterate mother he adored; an Algiers childhood of real poverty. The Sartre rupture of 1952 and the agony of the Algerian war coincided with a documented depressive crisis in the mid-1950s — paralysis, block, despair — out of which came The Fall's scalding self-portraiture and the line in "Return to Tipasa" that therapy culture has quoted ever since, usually without knowing it was written from inside the winter it names: "In the midst of winter, I found there was, within me, an invincible summer." He won the Nobel at forty-four and died at forty-six in a car crash, the unused train ticket for the same journey in his pocket — the absurd countersigning his death.
The lessons
Anxiety is ontological before it is pathological. Kierkegaard's distinction — fear has an object, anxiety has none, because its object is freedom itself — is the deep structure beneath the clinical one, and it carries a treatment theory. If anxiety is constitutive of being a self that must choose, it cannot be eliminated, only related to well or badly — and the badly is specific: avoidance. Rollo May (whose The Meaning of Anxiety is Kierkegaard's argument with citations) and Tillich formalized the claim: neurotic anxiety is the price of evading existential anxiety; we shrink the self to shrink the dread, and the shrinkage becomes the disorder. That is the exposure principle stated a century early — anxiety must be passed through, not outrun — plus the maxim every anxious patient eventually needs: the goal of treatment is not a life without dizziness; it is learning, in his phrase, to be anxious in the right way.
Despair is not depression — and it can smile. The Sickness unto Death describes a condition orthogonal to symptom checklists: a self out of relation with itself, fully compatible with function, success, and cheer — "the despair that does not know it is despair."
His most clinical sentence is the quiet one: the greatest hazard, losing oneself, "can occur very quietly in the world, as if it were nothing at all"; every other loss — an arm, a leg, five dollars — is sure to be noticed.
The journal entry from the party is the case illustration, and the Goethe essay's Eckermann confession is its twin. Two practice implications. First, screen behind intact function: the patient with nothing on the PHQ-9 and no self left is not well. Second, keep the registers distinct: depression is psychiatry's to treat; despair may answer only to meaning, commitment, and (for Kierkegaard) faith — the same remainder the Macbeth doctor marked with "more needs she the divine than the physician." Medicating despair as if it were depression fails in both directions: the drug doesn't work, and the question gets deferred.
All true helping begins where the other is. Kierkegaard wrote the founding sentence of motivational interviewing in 1848: to lead a person to a specific place, "one must first and foremost take care to find him where he is and begin there — this is the secret in the entire art of helping" — adding that all true helping therefore begins with humbling, the helper placing himself under the one to be helped. His whole authorship practices the corollary: where the problem is the person's relation to a truth, direct instruction is useless — hence pseudonyms, irony, indirection, the maieutic. "Truth is subjectivity" is the same point as the oldest distinction in psychotherapy, between intellectual and emotional insight: the interpretation a patient cannot appropriate is noise. Every Socratic question in CBT, every reflection in MI, every refusal to argue with ambivalence head-on, is Kierkegaardian method.
Refuse both bad faiths. Sartre's facticity–transcendence structure generates, once again, this series' signature twin-error scheme — and in the clinic both errors are daily. Bad faith number one collapses the person into facticity: I am a depressive; I am borderline; this is simply what I am — the diagnosis swallowed as essence, change foreclosed in advance (the "I am bipolar" reification flagged in the Hume essay, now with its mechanism named). Bad faith number two denies facticity: it's all willpower; there is no illness; just choose — transcendence without a body, the cruelty of the bootstrap. Good treatment is the refusal of both at once: the disorder is real, and you are not it. Yalom drew the practical corollary that dissolves the apparent cruelty of "responsibility": the patient is not to blame for the condition's causes, and is nonetheless the only possible author of the change — responsibility for the future without indictment for the past. Sartre's coward who can stop making himself cowardly is not a moral accusation; it is the load-bearing assumption of every psychotherapy ever devised.
The Look: shame, stigma, and the gaze that fixes. Sartre's analysis of being-seen — shame as the primordial discovery that one is what another's gaze makes of one — is the phenomenology underneath social anxiety, paranoia's felt surveillance, and, above all, stigma. "Hell is other people," he insisted later, was never misanthropy: hell is other people when relations congeal — when one's being is held hostage to a frozen judgment. Psychiatric labeling at its worst is exactly a frozen Look (Malvolio's dark room, institutionalized), and internalized stigma is the patient adopting that gaze as self. The therapeutic relationship, read in these terms, has a precise function: to be the other gaze — one under which the patient is seen as transcendence and not only facticity — until they can hold it themselves.
Emotions are conduct. Sartre's early sketch — emotion as a magical transformation of the world attempted when practical routes are blocked (the fainting that abolishes the unbearable scene; the rage that simplifies an unsolvable situation) — is functional analysis before behaviorism got there: ask not only what a patient feels but what the feeling does, what it spares, what it makes unnecessary. Handled crudely, this becomes blame; handled well, it is the most respectful question in the consulting room, because it treats symptoms as intelligible strategies of a cornered agent — the same hermeneutic charity the Shakespeare essay called method in madness — and strategies, unlike essences, can be renegotiated.
Suicide is a philosophical question as well as a medical emergency. Camus's opening move is a standing correction to a field that sometimes hears the meaning-question only as risk to be assessed. Some suicidality is the episode speaking — the Humean caveat from the first essay stands, and Camus himself notes that the act ripens "in the silence of the heart" far from syllogisms. But some of it is the question itself: is this worth it? — and a clinician should be able to meet that question on its own ground, because Camus supplies an actual answer rather than a deflection. The absurd, honestly faced, argues for more life, not less: suicide and consoling illusion are twin capitulations, and the alternatives — lucidity, revolt, passion, the scorn no fate survives — make Sisyphus imaginable as happy without a single metaphysical IOU. This is the philosophical backbone of the meaning-centered and dignity therapies built for patients facing real death sentences, and of the existential framing in psilocybin trials for terminal distress; it is also the deepest account of why "the existential vacuum" (Frankl's term) sits under so much treatment-resistant misery. Psychiatry manufactures hows; Camus is a why that requires no heaven.
Rieux's ethic: decency without guarantees. The Plague is the best book ever written about clinician morale, and it earns the claim by refusing every consolation. Rieux cannot cure the plague; he will lose; the bacillus, the last page warns, never dies but waits. His resources are exactly two: common decency, which he defines as doing his job, and the solidarity revolt creates — the discovery, in the narrator's closing words, that there is more in human beings to admire than to despise. He never habituates to dying children and never pretends his losses are victories. For a specialty whose diseases are chronic and relapsing, whose wins are partial, and whose practitioners burn out precisely when they demand guarantees from work that cannot give them, Rieux is the professional ideal stated at its true price: fight unwinnable battles well, together, without appeal. The invincible summer is not a poster; it was written by a depressed man in a hard winter, and it names something earned.
Coda: the school it became
The transmission line into the clinic is short and documented. Jaspers — this series' recurring hinge — named the limit situations (death, suffering, guilt, struggle) that cannot be solved, only faced. Frankl built logotherapy on the why that bears any how; Binswanger and Boss built Daseinsanalyse (Binswanger's Ellen West remains existential analysis's most famous and most chastening case); May carried it to America; Laing's The Divided Self used the whole toolkit — ontological insecurity is Kierkegaard plus Sartre — to make psychosis intelligible, an achievement his later anti-psychiatric drift discounted but did not erase. Yalom organized everything into the four givens — death, freedom, isolation, meaninglessness — and Becker's The Denial of Death (Kierkegaard via Otto Rank) seeded terror management theory, which made death anxiety an experimental variable and, in recent clinical work, a plausibly transdiagnostic one. And the convergence keeps running: ACT's acceptance, defusion, values, and committed action are, respectively, Kierkegaardian anxiety-education, the refusal of essence, Camus's revolt, and the ethical stage — existentialism so thoroughly absorbed that the field forgot the citation.
The three deaths keep the doctrine honest. Kierkegaard fell in a Copenhagen street at forty-two, mid-fight, and refused communion from functionaries. Sartre, blind, refused the Nobel and was walked to his grave by fifty thousand people. Camus died at forty-six with the train ticket he didn't use in his pocket. None of the three got meaning guaranteed — they got it made, daily, against the silence, which was their whole claim. Compressed for the clinic, the banner reads: anxiety is the dizziness of freedom, so teach people to be anxious in the right way; despair can smile, so look behind the function; begin where the patient is; refuse both bad faiths; be the unfreezing gaze; ask what the symptom does; meet the question of suicide with an answer as well as an assessment; and practice like Rieux — decency, solidarity, no guarantees, Sisyphus happy.
Related articles
Stoicism
The Stoics conceived philosophy as a clinic — destructive emotion as assent to a false judgment, treatable by changing appraisal — and became the documented ancestor of cognitive therapy.
PhilosophyFriedrich Nietzsche
Nietzsche was psychiatry's philosopher of suffering and meaning — arguing that senseless suffering, not suffering itself, is the enemy, and that health is a capacity won repeatedly rather than an absence.
PhilosophyArthur Schopenhauer
Schopenhauer made the blind, insatiable Will the root of suffering — describing the hedonic treadmill, the porcupine problem of intimacy, and the insight that the suicidal person still wills life, dissatisfied only with its conditions.
PhilosophyViktor Frankl
Frankl, a suicide specialist before he was an Auschwitz survivor, argued that the freedom to choose one's attitude survives even the worst circumstances and that the will to meaning is a clinical register distinct from depression — while insisting suffering should be removed wherever it can be.