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Now among the elements the top rank is held by fire, which has the greatest light, while the lowest in rank is held by earth which has a minimum of light. Consequently, the moon, which is the lowest of the heavenly bodies, is proportionate to earth and is in some sense similar to it in nature — for which reason it cannot be totally lit up by the sun.

The Collected Works of St. Thomas Aquinas. Exposition of Aristotle's Treatise on the Heavens. Lecture 12


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