存在主义入门：萨特、加缪与生命的意义 | What Is Existentialism: A Complete Introduction

The Philosophy of Radical Freedom

Existentialism is the philosophy that confronts the hardest questions head-on: What is the meaning of life? How should I live when there are no given answers? Am I free, and if so, what am I supposed to do with that freedom?

Emerging in the 19th and 20th centuries through thinkers like Søren Kierkegaard, Friedrich Nietzsche, Jean-Paul Sartre, Simone de Beauvoir, and Albert Camus, existentialism is not a unified school but a shared sensibility — the conviction that philosophy must start not from abstract systems but from the concrete, lived experience of the individual human being, struggling with anxiety, freedom, death, and the search for meaning.

Sartre captured the core insight in his famous slogan: 'Existence precedes essence.' We are not born with a pre-given nature, a destiny, or a purpose. We are thrown into existence, and we must create ourselves through our choices. This is terrifying — and liberating.

This guide introduces existentialism's key concepts: the death of God, radical freedom, bad faith, authenticity, and the absurd. It is a philosophy for people who refuse to accept ready-made answers and who are willing to face the full weight of their own freedom.

Existentialism starts from lived experience — anxiety, freedom, death, and meaning. Sartre's slogan 'existence precedes essence' captures its core: we are not born with a purpose; we create ourselves through our choices. This guide introduces the key concepts of radical freedom, authenticity, and the absurd.

1. The Death of God and the Crisis of Meaning

Existentialism begins with a diagnosis. It is often described as a response to the 'death of God' — Nietzsche's famous declaration that the belief in a divine order that gives life meaning and morality has collapsed in the modern world.

For Nietzsche, this was not just a theological event but a cultural earthquake. If God is dead — if there is no transcendent source of meaning, no cosmic moral order, no divine plan — then where do values come from? The danger, Nietzsche warned, is nihilism: the belief that nothing matters, that all values are equally meaningless.

But Nietzsche saw the death of God as an opportunity as much as a crisis. If we are no longer given meaning from above, we must create it from below. The 'overman' (Übermensch) is the person who has the courage to create their own values in the absence of divine or traditional authority.

The existentialists took Nietzsche's diagnosis and developed it further. Kierkegaard had already argued that faith was not a comfortable conclusion of rational argument but a 'leap' — a choice made in anxiety and uncertainty. The theme is consistent: in the modern world, meaning is not discovered but made, and making it requires courage.

Nietzsche's 'death of God' is the existentialist starting point: if there is no transcendent source of meaning, how do we avoid nihilism? The existentialist answer: meaning is not discovered but created — and creating it requires courage.

2. Radical Freedom and Bad Faith

Jean-Paul Sartre's existentialism is built on a single, stark claim: human beings are 'condemned to be free.' We did not choose to exist, but now that we exist, we are radically responsible for everything we become. There is no human nature that determines us, no destiny that guides us, no excuse that absolves us. We are what we choose to make of ourselves.

This freedom is vertiginous. It is anxiety-provoking precisely because there is no external authority to appeal to — no sacred text, no expert, no tradition — that can make our choices for us. Every choice is ultimately groundless. Sartre illustrates this with the example of a young man during World War II who must choose between joining the Free French Forces to fight the Nazis or staying home to care for his aging mother. No ethical system can tell him what to do. He must choose, alone, and in choosing, he defines not only his own life but, in a sense, what it means to be human.

Because radical freedom is so uncomfortable, we are constantly tempted to flee from it — a condition Sartre calls 'bad faith' (mauvaise foi). Bad faith is lying to oneself about one's freedom. The waiter who performs his role with mechanical precision, pretending to be nothing but a waiter, is in bad faith — he is denying his freedom to be otherwise. The person who says 'I had no choice' is almost always in bad faith — they are hiding their freedom behind a supposed necessity.

Simone de Beauvoir extended this analysis to gender in The Second Sex: women, she argued, have historically been forced into bad faith — defined as 'the Other' by a male-centered culture, denied the recognition of their own freedom and transcendence.

Sartre's radical freedom: we are 'condemned to be free' — responsible for everything we become, with no external authority to appeal to. 'Bad faith' is the flight from this freedom — lying to ourselves about our choices. De Beauvoir extended this analysis to gender in The Second Sex.

3. The Absurd: Camus and the Myth of Sisyphus

Albert Camus, who famously rejected the 'existentialist' label, nevertheless engaged with the same themes — most powerfully in The Myth of Sisyphus (1942).

Camus begins with a blunt statement: 'There is but one truly serious philosophical problem, and that is suicide. Judging whether life is or is not worth living amounts to answering the fundamental question of philosophy.'

The problem, as Camus sees it, is the Absurd. The Absurd is not in the world alone or in the human mind alone but in the collision between the two — between the human need for meaning, purpose, and clarity, and the universe's complete indifference to that need. The universe does not care about our hopes, our sufferings, or our search for meaning. And yet we cannot stop searching.

Faced with this absurd condition, what should we do? Suicide is a refusal of the problem, not a solution. Philosophical suicide — leaping into religious faith or ideological certainty — is an evasion. Camus proposes a third option: revolt. We must live in full awareness of the absurd without surrendering to it. We must find meaning in the struggle itself.

This is the meaning of Sisyphus. Condemned by the gods to roll a boulder up a hill, only to watch it roll back down, for all eternity — Sisyphus is the absurd hero. But Camus ends the essay with a startling claim: 'One must imagine Sisyphus happy.' Not because his task is meaningful in any cosmic sense, but because he fully owns his fate. In the moment of consciousness — in the pause at the top of the hill, watching the boulder roll back down — Sisyphus is free.

Camus's Absurd is the collision between humanity's need for meaning and the universe's indifference. His answer: revolt — live in full awareness without surrendering. Sisyphus, who fully owns his fate, must be imagined happy.

4. Authenticity: The Existentialist Ideal

If 'bad faith' is the existentialist diagnosis, 'authenticity' is the cure. But what does authenticity actually mean?

For Kierkegaard, authenticity is becoming a 'single individual' — not losing oneself in the crowd, not living by the opinions of others, but standing alone before God (or before one's own existence) and making the choices that define who one is. 'The crowd is untruth,' Kierkegaard wrote. Truth is subjectivity — not in the sense of arbitrary opinion, but in the sense of passionate personal commitment.

For Heidegger, authenticity (Eigentlichkeit) means owning one's own death. It means confronting the fact that one's existence is finite, that no one else can die one's death, and that this finitude gives every moment an urgency that inauthentic existence — lost in 'the They' (das Man) of anonymous public opinion — evades.

For Sartre, authenticity is living with full awareness of one's radical freedom and refusing the comfort of bad faith. The authentic person does not say 'I am just following orders' or 'that's just how I am' or 'society made me this way.' They say: I chose this, and I am responsible.

Existentialism, in all its varieties, is a philosophy of affirmation in the face of groundlessness. It is not cheerful — it is honest. And within that honesty, it finds a strange, hard-won liberation.

Authenticity — the existentialist answer to bad faith — means owning your choices and mortality. Kierkegaard: become a 'single individual.' Heidegger: own your death. Sartre: live with full awareness of radical freedom. It is an honesty that liberates.