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Man (n.) defined as a 'rational animal' is a trap: one question becomes two, and each harder than the first.
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Man (n.) is a mean between God and nothing, placed between absolute being and non-being, and erring in so far as he shares in nothing.
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Man (n.) is not merely the foreman of creation: he carries God's creative work forward by building knowledge on principles God made.
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Man (n.) enters physics last, as the spectator of everything that light touches.