Existentialism is less a doctrine than a family of thinkers who share a concern: the individual, concrete, lived experience of existing. Kierkegaard, Nietzsche, Heidegger, Sartre, de Beauvoir, Camus. They disagreed on much, but they agreed that abstract systems miss something essential. Philosophy, they thought, should start from the situation of the person who asks the questions.

Sartre gave the movement its most famous slogan: existence precedes essence. For a knife, essence comes first. The design determines what it is. For a human being, there is no pre-given design. We exist first, and then we define ourselves through our choices. That freedom is exhilarating and terrifying. Sartre called it condemnation. De Beauvoir applied existentialist ideas to gender, arguing that one is not born a woman but becomes one. Heidegger analyzed being-toward-death and authenticity. Camus explored the absurd. Existentialism influenced literature, psychology, theology, and politics. It remains a resource for anyone asking how to live without a script.

Existentialist themes

• Existence precedes essence. We create ourselves through action.
• Freedom and responsibility. We are accountable for our choices.
• Authenticity. Living in accord with one's own possibilities.
• Absurdity. The tension between meaning-seeking and a silent universe.

Existentialism is not a recipe for despair. It is a call to take responsibility for your life, without guarantees.