"Reason may be employed in two ways to establish a point: firstly, for the purpose of furnishing sufficient proof of some principle... Reason is employed in another way, not as furnishing a sufficient proof... but... confirming an already established principle, by showing the congruity of its results, as in astronomy the theory of eccentrics and epicycles is considered as established, because thereby the sensible appearances of the heavenly movements can be explained [saved] (possunt salvari apparentia sensibilia); not, however, as if this proof were sufficient, forasmuch as some other theory might explain them."
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Thomas Aquinas, Summa Theologica (ca. 1269; 1485) I, q. 32, art. 1, reply obj. 2. Note:possunt salvari apparentia sensibilia (sensible appearances can be saved).
https://en.wikiquote.org/wiki/Saving_the_appearances
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Saving the appearances
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