Jean-Paul Sartre (1905–1980)
Sartre is the philosopher who made existentialism a public scandal. In a Paris still smelling of the Occupation, he took the dense phenomenological machinery of Husserl and Heidegger, stripped it of its academic armor, and handed it to the general public as a philosophy of absolute, unbearable freedom. The result was that for about a decade after 1945, “existentialism” was a word you could hear in cafés and read in gossip columns — and the person everyone was arguing about was Sartre.
What he insisted on, over and over, was a single reversal: existence precedes essence. There is no human nature waiting for you at birth, no cosmic role you were designed to fill, no God holding the blueprint. You show up in the world first, and then — by what you do — you define what you are. The weight of that reversal is the core of everything he wrote. It means you are entirely free. It means you are entirely responsible. It means there are no excuses: not genes, not upbringing, not passion, not “I am this kind of person.” A coward, he liked to say, is defined by the fact that he has acted cowardly; he can stop any time he chooses.
This is not comforting, and Sartre didn’t pretend it was. The experience of being free in this radical sense is anguish. The experience of finding the world meaningless without you is nausea. The experience of being seen by another person, and suddenly becoming an object in their world instead of a subject in your own, is shame. Sartre’s whole career is an attempt to describe these experiences with enough precision that you can’t look away from them — and then to insist that any attempt to hide from them is mauvaise foi, bad faith, the original sin of his system.
The Three Works on This Site
First — Nausea (1938), the novel. A provincial historian named Roquentin notices that ordinary objects are starting to lose their names. A chestnut tree root in a park strips him of every comforting category — species, function, purpose — and leaves him face to face with the brute fact that things just are, without reason. The whole philosophical vocabulary Sartre will spend the next decade hammering out — contingency, the in-itself, bad faith, the “Bastards” who think they have a right to exist — is already there, compressed into the diary of a man slowly realizing the world is not what he was raised to believe.
Second — Being and Nothingness (1943), the magnum opus. Written during the Occupation, it splits reality into two regions: being-in-itself (solid, opaque, meaningless objects) and being-for-itself (human consciousness, which is nothing but a hole of negation in the middle of being). Freedom is the structure of that nothingness. Bad faith is our endless attempt to flee it. The Look of the Other — caught at the keyhole, frozen by shame — discovers that other people are ontologically threatening, that relations with them are originally conflictual, not cooperative. The book ends with the line “Man is a useless Passion”: we are structurally aimed at becoming something impossible (the self-grounding God), and we exhaust ourselves in the attempt.
Third — Existentialism Is a Humanism (1945), the lecture. Sartre delivered this to a packed Paris hall a few months after the Liberation, mostly to defend existentialism from two sides at once: the Communists, who called it bourgeois quietism, and the Catholics, who called it nihilism with a French accent. The lecture compresses Being and Nothingness into a few sharp moves — existence precedes essence, man is condemned to be free, in choosing yourself you choose for all humanity — and turns it, almost defiantly, into an ethics of action. Sartre later disowned parts of it. But as a first door into his thought, it’s still unbeatable.
Why He Matters
Sartre made freedom uncomfortable. Almost every philosopher before him who talked about freedom talked about it as good news — as the thing that lets you flourish, make good choices, live well. Sartre says: freedom is the thing you can’t get rid of no matter how much you want to. It’s not a gift, it’s a condemnation. You didn’t choose to be free, you can’t stop being free, and every second of your life you are responsible for the person you are becoming. That reframing — from freedom as opportunity to freedom as burden — is the most influential move of twentieth-century philosophy outside the analytic tradition.
He also broke the academic monopoly on philosophy. Being and Nothingness is six hundred pages of phenomenological ontology, but Sartre also wrote the novel, the plays, the biographies, the political essays, the autobiography. He insisted that philosophy had to describe what being a human actually feels like — the café waiter playing at being a café waiter, the woman on the date who lets her hand rest dead in the man’s to avoid deciding, the voyeur at the keyhole, the shame of being seen. That’s why he still gets read: the vignettes are unforgettable even when the metaphysics is not.
Style
Sartre is a maximalist. He will write a four-hundred-word sentence if it gets him where he’s going. He loves paradox to the point of tic (“being what it is not and not being what it is”). He is capable of stunning, unambiguously literary writing — Roquentin’s chestnut root, Pierre’s absence in the café, the voyeur at the keyhole — and capable of whole chapters that read like a phenomenologist trying to out-Heidegger Heidegger. The novel and the lecture are the easy ways in. The treatise is the hard way in, but it’s where he actually builds the system.
Connections
- Kant — Sartre’s relationship to Kant is ambivalent. On one hand, his formula “in choosing for himself he chooses for all men” is the Categorical Imperative smuggled in without the metaphysics — a universalizability test without the transcendental grounding. On the other hand, Sartre explicitly refuses Kant’s a priori moral law: there is no “intelligible heaven” of values to consult; you invent them by acting. Sartre is what happens when Kantian freedom survives the death of Kant’s God.
- Dostoevsky — Sartre quotes him directly at the core of the humanism lecture: “If God did not exist, everything would be permitted.” Dostoevsky meant it as a warning. Sartre picks it up as a starting point. The whole existentialist project can be read as an attempt to live inside Dostoevsky’s diagnosis without flinching from it — to accept that without God everything is permitted, and then build an ethics anyway.
- Kafka — Kafka’s protagonists live in Sartrean bad faith’s natural habitat. Joseph K. in The Trial is caught by a Law that commands unconditionally without offering any reason; he spends the whole novel trying to negotiate with his own freedom by pretending the Court is solid, other, outside him. What Kafka dramatizes as nightmare, Sartre diagnoses as structure.
- Schopenhauer — the distant pessimist ancestor. Schopenhauer’s Will-as-blind-striving is one of the deep sources of twentieth-century “existence as problem rather than gift.” Sartre’s nothingness and Schopenhauer’s striving are two answers to the same question — what is the underlying structure of human reality, under the furniture? The whole Sartrean anguish is audible in Schopenhauerian pessimism played at a different frequency.
Lineage
- Predecessors: Descartes (the cogito as Sartre’s starting point), Hegel (master-slave dialectic → the Look), Kierkegaard (anguish, the leap), Husserl (phenomenological method), Heidegger (Being-in-the-world, though Sartre breaks with him on Mitsein), Dostoevsky (“everything is permitted”).
- Successors: Simone de Beauvoir (who extended existentialism into feminism in The Second Sex), Merleau-Ponty, Frantz Fanon (existentialism as anti-colonial weapon), the “Theatre of the Absurd” (Beckett, Ionesco), and the broader post-war European left. Later post-structuralists — Foucault, Derrida — define themselves partly against him.