
Existence precedes essence. He said it, lived it, and refused the Nobel Prize to prove it.
Sartre's key move was reversing the traditional order: for objects, essence comes first — a hammer is designed to be a hammer before it exists. For humans, there is no blueprint. You exist first, then make yourself what you are. This terrifying freedom — condemned to be free, as he put it — is the foundation of everything else: bad faith (pretending you had no choice), authenticity (owning that you did), and the gaze of the other (the moment someone else's look turns you into a thing). He wrote philosophy, plays, novels, and political journalism in equal torrents. He refused the Nobel Prize in 1964 because he believed it would compromise his independence. He had previously refused the Legion of Honor. He lived in a small Paris apartment, gave most of his money away, and chain-smoked and argued until he could not see. He was wrong about Stalin for too long. He was right about freedom for long enough.

“Existence precedes essence.”
“Hell is other people.”
Being and Nothingness appeared in Paris in 1943, while the city was under German occupation. Its seven-hundred-page analysis of freedom and bad faith was immediately recognized as the central work of existentialism. That freedom should be its subject, in occupied Paris, gave the book an urgency that went beyond its argument.
In October 1964, Sartre was awarded the Nobel Prize in Literature — and declined it. He gave two reasons: that a writer should not become an institution, and that accepting prizes from the West had political implications he could not endorse while Cold War divisions remained. He was the first person to voluntarily refuse the Nobel Prize.
Sartre read Husserl in a Berlin café in 1932 and returned to Paris to make phenomenology existentialist. Consciousness as intentional, always aimed at something beyond itself, became the engine of Sartre's account of freedom.
Being and Time gave Sartre the vocabulary for Being and Nothingness: facticity and transcendence, authenticity and bad faith. Heidegger later complained that Sartre had humanized — and missed — what Being and Time was about.
Sartre placed Dostoyevsky alongside Kierkegaard as a precursor of existentialism. The underground man's assertion that two plus two may equal five — that human freedom exceeds rational determination — anticipates Sartre's own account of consciousness as that which is not what it is.
Sartre wrote the preface to The Wretched of the Earth, connecting Fanon's analysis to his own account of freedom, authenticity, and the violence of dehumanization. Fanon drew on Sartre's existentialism to articulate colonial subjectivity.
Merleau-Ponty co-founded Les Temps modernes with Sartre and Beauvoir and shared their generation's turn to phenomenology, before breaking with Sartre publicly over the Korean War and the ethics of aligning with Soviet communism.
Murdoch wrote one of the first English-language studies of Sartre in 1953, then spent the rest of her career arguing against his picture of radical, unconditioned freedom in favor of a Platonic account of goodness as something discovered, not chosen.
Camus and Sartre were the two most visible philosophers in postwar France until Camus's The Rebel, with its critique of revolutionary violence aimed at Soviet communism, triggered a bitter public break between them that neither man fully repaired.