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Kant's successors — Fichte, Schelling, and above all Hegel — pushed his insight that mind constitutes reality to its radical conclusion: reality itself is the self-development of rational spirit (Geist). Hegel's dialectic traces this development through history — contradiction driving progress — making German Idealism the most ambitious philosophical system ever constructed, and the direct ancestor of Marx, Kierkegaard, and twentieth-century existentialism.