Being and Time
Being and Time (Sein und Zeit, 1927) is Martin Heidegger’s foundational work and one of the most influential philosophical texts of the twentieth century. Written while Heidegger was teaching at Marburg, it is a radically original investigation into the question of Being — not beings (particular entities) but Being itself, the condition that allows entities to show up as meaningful at all. The book is both a phenomenological description of human existence and an inquiry into the structure of understanding and time that makes existence possible.
Central Argument
Heidegger begins with the observation that Western philosophy has forgotten the question of Being. Metaphysics has focused on beings — God, substance, nature, consciousness — but has taken for granted the more fundamental question: what does it mean for anything to be? To approach this question, Heidegger turns to the one entity for whom Being is itself an issue: the human being. Heidegger calls this entity Dasein (literally “being-there”), a term chosen precisely to avoid the conceptual baggage of “subject,” “person,” or “consciousness.”
Dasein is not a subject standing over against objects but a way of being that is always already engaged with the world. To be human is to be being-in-the-world — not located in a container called “world” but structurally open to and enmeshed with what is around us. The world is not primarily a collection of objects we observe but a meaningful context of involvement and concern. Things show up as meaningful because Dasein is always already caring about something, engaged in projects, operating within a web of significance.
Care (Sorge) is the fundamental structure of Dasein’s being. To exist is to be concerned with one’s own existence, thrown into a world not of one’s choosing, projecting possibilities, and always already ahead of oneself. This structure of thrownness (being delivered into a situation), projection (orienting toward possibilities), and fallenness (absorbed in the everyday world) constitutes the temporal structure of existence. Being is fundamentally temporal — not in the sense of occurring within measurable time but in the sense that existence is structured by past (thrownness), future (projection), and present (fallenness).
The analysis of Dasein is preparation for the deeper question of Being itself, but the book famously breaks off before completing this second part. What remains is an extraordinarily rich phenomenology of human existence that has influenced existentialism, hermeneutics, psychoanalysis, and relational thought.
Influence and Legacy
Being and Time reshaped twentieth-century philosophy. It provided the philosophical foundation for existentialism (though Heidegger rejected the label), influenced Sartre and Merleau-Ponty, and became central to hermeneutic philosophy through Gadamer’s work. In psychology and psychoanalysis, it grounded the existential therapies of Ludwig Binswanger and Medard Boss, and provided a phenomenological framework for understanding embodiment, anxiety, and the structure of selfhood.
For relational and somatic practices, Being and Time offers a philosophical account of what it means to be fundamentally relational: Dasein is not a self-contained subject but a being whose structure is being-with (Mitsein) and being-in-the-world. Care, thrownness, and authenticity provide conceptual resources for understanding presence, responsiveness, and the existential dimension of relational encounter.
Key Concepts
- Dasein — The human way of being; the entity for whom Being is an issue.
- Being-in-the-world — The fundamental structure of human existence; not a subject in a container but an engaged openness.
- Care (Sorge) — The unified structure of Dasein’s being; concernful engagement with existence.
- Thrownness (Geworfenheit) — The givenness of being delivered into a world and situation not of one’s choosing.
- Projection (Entwurf) — Dasein’s orientation toward possibilities; being ahead of oneself.
- Fallenness (Verfallen) — Absorption in the everyday world and the “they” (das Man).
- Authenticity and inauthenticity — Modes of existing: owning one’s existence vs. fleeing into conformity.
- Being-toward-death — The recognition of finitude as the condition of authentic existence.
- Temporality — The horizon of Being; existence structured by past, present, future.
Connections
- Martin Heidegger — Author.
- Existentialism — Though Heidegger rejected the term, Being and Time is a foundational text.
- Phenomenology — Heidegger’s method is phenomenological, though he transforms Husserl’s project.
- Being-in-the-world — Core concept; the structure of Dasein’s existence.
- Dasein — The starting point of the inquiry.
- Care — The unified structure of Dasein’s being.
- Thrownness — The given dimension of existence.