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When reason argues itself into contradiction
💡 When reason overreaches beyond possible experience, it generates antinomies — equally provable contradictions — revealing that it has strayed past its legitimate boundaries.
What happens when reason ignores its limits and tries to grasp the whole universe as a thing-in-itself? In the Transcendental Dialectic, Kant shows it collapses into the antinomies — pairs of opposing claims that reason can both prove with equal rigor.
Take the first: the world has a beginning in time and is bounded in space — versus — the world is infinite in both. Or the famous third antinomy: everything happens by strict causal necessity — versus — there must also be freedom, a spontaneous cause. Each side furnishes an airtight-looking proof, yet they flatly contradict.
For Kant this isn't a paradox to solve so much as a diagnosis. The contradictions arise only because we illegitimately apply concepts like 'cause' and 'totality' — valid within experience — to the universe as a whole, which is never an object of experience. Recognize that the cosmos-in-itself is unknowable, and the antinomies dissolve. Crucially, this even leaves room for freedom: causal determinism governs the world of appearances, while freedom may belong to things-in-themselves.
Source: Critique of Pure Reason — Immanuel Kant