What Is Existence? Being, Consciousness, and Existentialism

Direct Answer

Existence is the fact of being real: that something is, as opposed to what it is. The chair exists; the number two, in some sense, exists; your thoughts exist. The most basic question about anything is whether it exists at all — and the concept of existence itself has proved notoriously hard to define. Kant said famously that existence is not a real predicate: "God exists" does not add a property to God the way "God is wise" does; it says that the concept is instantiated.

The philosophy of existence took a radical turn in the twentieth century. For Sartre, "existence precedes essence": unlike a paperknife, whose essence (its purpose and design) is fixed before it exists, a human being exists first and makes an essence through choices. Existence is thus not a static fact but a task — the site of freedom, anguish, and responsibility. This is the heart of existentialism.

Historical Context

The distinction between existence and essence is ancient. Plato's forms are essences that exist in a higher way than their changing instances; Aristotle made existence an actuality; the scholastics asked whether essence and existence are really distinct, with Aquinas answering that in creatures they are, and that existence is the act by which an essence is realized.

Modern philosophy complicated the concept. Descartes used existence as a property in his ontological argument; Kant denied it was a property at all. Husserl's phenomenology bracketed the question of whether things exist in order to study how they appear — a "suspension" of the natural attitude that led existentialists to return to existence with new urgency. Heidegger's Being and Time distinguished existence (Existenz) as the mode of being of the being that asks about being — Dasein — and Sartre took the distinction in an atheist direction: if there is no God, no essence precedes us, and we must create ourselves.

Key Concepts

Existence. The fact of being real; the instantiation of a nature or essence.

Essence. What a thing is — its defining nature or properties.

Existence precedes essence. Sartre's thesis: for human beings, there is no pre-given nature; we first exist and then define ourselves through free projects.

Dasein. Heidegger's term for the human being, whose being is an issue for it — existence as care and temporality.

Bad faith. Sartre's name for denying our freedom by pretending we have a fixed essence — "I couldn't help it, that's just who I am."

Anguish (angoisse). The experience of radical freedom: the awareness that nothing forces us to choose, and that we are responsible for everything.

Philosophical Perspectives

The existentialist account of existence is the most influential modern one. For Sartre, consciousness is "being-for-itself" (pour-soi) — a mode of being defined by not being what it is and being what it is not, which is to say: a mode of being defined by freedom. Things are "being-in-itself" (en-soi) — dense, complete, unreflective existence. The human being exists in the mode of a project: ahead of itself, choosing, creating its own essence through action. This is why "existence precedes essence" is not a slogan but a description of the structure of human reality.

Against this, the metaphysical tradition holds that existence is simpler: to exist is to be an object of some kind. The analytic philosophy of existence asks whether "exists" is a predicate, whether existence is a property of individuals, and whether there are nonexistent objects (Meinong's problem). These questions seem dry next to existentialism, but they converge: what does it mean for something to be at all?

Heidegger, between the two, insisted that the question of existence is the question of being, and that it must be asked from within existence: we are the beings for whom being matters. Existence, for Heidegger, is not a fact to be described but a way of being to be lived — being-toward-death, being-in-the-world, care.

Modern Reflection

The concept of existence now stretches beyond the human. Does an AI "exist" in the relevant sense if it has no consciousness? Do possible worlds exist? Does the universe's existence require explanation — or is "why is there something rather than nothing" the deepest and most unanswerable question? Physics and cosmology have adopted the vocabulary of existence without settling its meaning.

In daily life, the existentialist emphasis on existence has become the grammar of self-help and therapy: we are told to "create ourselves," to own our choices, to resist the temptation to blame our nature. Whether or not one accepts the metaphysics, Sartre's insight — that human existence is not a fixed thing but an ongoing project — has permanently changed how we think about identity, responsibility, and freedom. Existence, it turns out, is not the most abstract philosophical topic; it is the most concrete one.

Related Thinkers

• Jean-Paul Sartre — existence precedes essence
• Edmund Husserl — phenomenology and lived experience
• Martin Heidegger — Dasein and the question of being
• Aristotle — actuality and the categories

Related Quotes

• "Existence precedes essence." — Jean-Paul Sartre, Existentialism Is a Humanism
• "The human being is the being whose being is an issue for it." — Martin Heidegger, Being and Time (paraphrase)
• "Man is nothing else but what he makes of himself." — Jean-Paul Sartre

Sources

• Existence — Stanford Encyclopedia of Philosophy
• Jean-Paul Sartre — Stanford Encyclopedia of Philosophy
• Martin Heidegger — Stanford Encyclopedia of Philosophy
• Nonexistent Objects — Stanford Encyclopedia of Philosophy

Further Learning

• Continue with What Is Being? and What Is Nothingness?
• Read Existentialism Is a Humanism in the book library
• Explore the Understanding Reality collection