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Thinker · 1813 CE–1855 CE

Søren Kierkegaard

Writing largely under pseudonyms such as Johannes Climacus, Johannes de Silentio, and Vigilius Haufniensis, Kierkegaard mounted a sustained critique of Hegelian system-building and of the complacent "Christendom" of the Danish state church, developing themes that became foundational for existentialism - the primacy of subjective, lived truth over detached objective knowledge, a threefold account of the aesthetic, ethical, and religious stages of existence, anxiety (Angest) as the dizziness of confronting one's own freedom, and the "leap" of faith exemplified by Abraham's binding of Isaac in "Fear and Trembling."

Intellectual setting

Kierkegaard wrote in Golden Age Copenhagen, reacting against the dominance of Hegelian philosophy in Danish intellectual life (represented above all by the theologian Hans Lassen Martensen) and against what he saw as the spiritual complacency of the established Danish Lutheran church under Bishop J. P. Mynster. His broken engagement to Regine Olsen, his public feud with the satirical weekly "Corsaren," and his final "Attack upon Christendom" pamphlets in the year of his death were all woven into his authorship.

Key ideas

The stages (spheres) of existence

Kierkegaard distinguished the aesthetic, ethical, and religious as qualitatively distinct ways of relating to oneself and to existence, arguing that movement from one sphere to another requires a decisive, non-rational "leap" rather than gradual rational or dialectical progression.

Subjective truth and the leap of faith

Against Hegelian claims to objective, systematic knowledge, Kierkegaard held that the truths that matter most - especially religious ones - cannot be grasped through detached reasoning but only through passionate, subjective appropriation, most starkly dramatized by Abraham's paradoxical faith in "Fear and Trembling."

Legacy

Widely regarded as the father of existentialism, Kierkegaard decisively shaped Heidegger, Jaspers, Sartre, and Camus, as well as twentieth-century Protestant theology through Karl Barth and Rudolf Bultmann and later philosophy of religion. His experiments with pseudonymous, indirect communication and his critique of philosophical system-building remain central reference points in existentialist and continental philosophy.