Ignorance-Knowledge: 128

In Heidegger's language, "When Dasein truly accepts the possibility of its own death, only then does it become 'authentic.'" If one denies death, humanity becomes lost in "Das Man"—that is, in "the world of others"—where everyone thinks death is something distant, or merely "other people's business." But the death-conscious person knows that death is always "coming toward me"; thus every moment becomes a possibility of the end, and every decision gains a kind of existential weight.

Sein zum Tode is no despair; it teaches humanity the true gravity of life. It teaches—"time is limited, so live now." When a person does not reject death but accepts it as an inseparable companion, then they learn to "live facing toward death"—this is authentic Being.

Angst—"existential anxiety" or "inner dread": The word "Angst" for Heidegger is not ordinary "fear." "Fear" always points toward some specific object—darkness, tiger, danger. But angst is not about anything specific; it is an "objectless" anxiety—where a person suddenly realizes they are a finite being, thrown into a mysterious world with no permanent refuge.

When "angst" arrives, the world suddenly becomes empty—all familiar things lose their meaning. In this experience, one understands that the "world they are in" has no certain foundation; everything is unreliable, transitory. In this very moment, one first realizes their thrownness (Geworfenheit)—they have been hurled into a world they did not choose—and simultaneously their possibilities (Seinkönnen) must be chosen by themselves alone, because no one else will live their life.

In Heidegger's philosophy, "Seinkönnen" (German: being able to be), meaning "being-able-to-be" or "the capacity for existence"—is a fundamental characteristic of human being that transforms existence from any static state into a dynamic possibility. Where Descartes had defined humanity as "thinking substance" (res cogitans) in a fixed manner—a "that which is"—Heidegger declared humanity to be fundamentally "being-in-becoming." Their "being" means "being-on-the-way-to-becoming"—and this capacity for becoming is what Heidegger calls Seinkönnen (pronounced: zine-kön-nen).

Breaking down this word literally—Sein (existence, being) + können (to be capable, to be able)—meaning "the power of existence," "being-as-possibility." Human existence is therefore not merely what one is now; rather, it is the entire field of possibilities of what one can become. One is not a complete object—an incomplete, open being who continuously constructs themselves through their decisions, desires, and circumstances.

In Heidegger's Being and Time it is said—"Dasein understands itself through its 'possibilities.'" That is, humanity knows itself—not through what it is now, but through the possibilities it faces. What a person "is" and what they "can become"—this distinction is the essence of Seinkönnen. Humanity is not born with a fixed essence; rather, in every moment it constructs its existence—through its choices, commitments, and actions.

Thus Seinkönnen becomes Heidegger's philosophy of freedom. Humanity is thrown (Geworfenheit)—it cannot choose its birth, culture, body, or context; but even within that thrown condition, it has the freedom to choose its possibilities. The situation in which it finds itself is determined; but how it will "be" within that—it determines itself. Therefore "Seinkönnen" and "Geworfenheit"—the two are not opposites but complementary.

When humanity consciously accepts this possibility, responsibly shapes its future, then it exists in "authentic being." But when it lives on society's predetermined path, in the manner of "as others live" (Das Man), then it loses its Seinkönnen—despite having possibilities, it confines itself to imitation. Therefore Heidegger says authentic life means realizing one's possibility in one's own way—seeing "what I can become" and having the courage to actualize it.

Seinkönnen is the vital center of Heidegger's existentialism. It declares—humanity is not a complete being; it is a moving project, an unfinished creation. "To exist" means not to remain static, but to remain open and responsible toward one's possibilities. Just as we are born in a "thrown" condition, our meaning is formed through "possibility." This process continues until death, because death-consciousness (Sein zum Tode) teaches us—time is limited, and within that limit, fulfilling one's possibility is the real "being." In Heidegger's words, humanity is that being "which is not what it is, but what it can become"—therefore Seinkönnen means that open capacity of existence where humanity authors its own future and continuously reconstructs its "being" with new meaning in every moment.

"Angst" awakens humanity from the sleep of "Das Man." When it loses social refuge, when the mask of "being safe in others' eyes" falls away, only then does it face its own existence alone. In this moment of solitude, it first understands "I am"—but this "being" has no fixed meaning; meaning must be created by me myself.

Therefore for Heidegger, "angst" is not weakness; it is existential revelation. It is humanity's opening toward its own being—a kind of inner silence where all assurance collapses, leaving only one's finite presence. This very realization leads humanity toward death—Sein zum Tode—where "existential fear" transforms into "existential clarity."

Sein zum Tode and Angst are two sides of the same existential insight. Angst awakens humanity—erasing all meaning, standing it before its thrown being; and Sein zum Tode teaches it—within this very finitude, create your own meaning. Death here is not ending but the door to awakening. And angst is the first tremor of that awakening—where humanity learns to understand that its "being" means not merely surviving, but continuously recreating itself anew.

Thus Heidegger's "Das Man" is not merely a philosophical concept; at its depth lies an ethical and psychological warning. When we live by the mantra "the way everyone does it," we lose both our capacity for thought and sense of responsibility. We learn to say, "I only did what everyone was doing"—and precisely this way we escape from the responsibility of our own existence. This idea of Heidegger's is incredibly relevant in today's technology-dependent world, where social media, trends, and public opinion unconsciously drive our thinking. We think we are free, but in reality we speak in the voice of "Das Man."

"Das Man" teaches us that existence's natural current flows along the path of imitation, but true freedom comes when one asks oneself—"Am I really living as myself, or just the way everyone lives?" This question itself is Heidegger's existentialist call. Seeing one's existence in light of one's death, taking responsibility for oneself, and consciously transcending the shadow of "Das Man"—this is the path of Authenticity. On this path, humanity expresses itself not in "what others say" but in "what I truly believe"—and that becoming is existence's true freedom.

But when humanity faces death—truly realizes that life is finite, time is running out—only then does it become inwardly alert. This alertness is not panic; it is transparency of Being. Recognition of death brings humanity back to itself, teaches it the importance of time, the weight of decisions, and the necessity of living life truthfully in this-moment-now. This condition is what Heidegger calls "Being-toward-death"—consciously living toward death.

"Being-toward-death" means not waiting for death, but death-conscious living—living as if every moment could be the last, and therefore each moment requires complete use of one's possibility. Facing toward death means seeing every decision of life in the context of its finitude—then every action of life gains gravity, every relationship gains depth.

Death therefore for Heidegger is not mere ending; it is life's inner mirror—where humanity sees its being truly for the first time. Death teaches us we are thrown within time, but within time we can choose our possibilities. This realization is the fulfillment of "Dasein": just as death is the symbol of finitude, it is also the source of meaning—the more deeply one acknowledges one's death, the more authentically one lives.

Dasein is not soul, not body, not a center of thought either; it is humanity itself—that which lives, relates, understands, questions, and gives meaning to its existence through its death. In Heidegger's words, "Humanity is not a being that contains existence; humanity is rather that being for whom existence itself becomes a question." Thus Heidegger's Dasein philosophy leads to a completely different understanding from Descartes' "I think"—"I am"—but that "being" is not static presence; it is an open position, a process of "being-in-the-world," where in every moment humanity stands between its possibility and finitude, continuously creating itself.

French philosopher Maurice Merleau-Ponty took this tradition further and established the 'Phenomenology of Perception.' He says the body is the language of the soul—we feel through the body, and the soul expresses itself through that feeling. According to Merleau-Ponty, the body is not merely an object; it is the center of our experience and perception. Our senses do not just collect information; they make the world meaningful for us. Walking, speaking, touching—all are accomplished through the body, and through these we understand ourselves and the world.

Through the body we connect with space and time and establish relationships with our personal history and future. That is, the body is not just a biological structure; it is a living experience, an integral part of our mental and spiritual existence. The body is our primary medium for understanding the world and establishing relationships with it.

Therefore "the seat of the soul" is not merely a physical location; it is a symbol of humanity's dual existence—where consciousness and matter, mind and body, interior and exterior world meet at each other's boundaries. Though Descartes' vision is now scientifically unproven, it remains philosophically profound because it repeats that ancient question—"Who am I?"—to which humanity still ponders, where within the body lives that soul which thinks, feels, and lives in constant dialogue with the world.