Sagacity

Definition and stakes

Proclus,  The philosophical and mathematical commentaries of Proclus on the first book of Euclid's elements… (1791)

“ Lastly, sagacity is an acute and sudden apprehension of the medium, or proper cause of a certain effect: as if any one, beholding the moon, should in a moment conjecture the cause of the part opposite to the sun being lucid, and the other parts obscure, because she derives her splendor from the sun. ”
Source: Gutenberg

Portrait of Isaac Taylor Isaac Taylor,  Natural History of Enthusiasm

“ For it is plain that if there were no perplexing irregularities, superior sagacity would be in no request; or, on the other hand, if there were not a real constancy in the course of affairs, even the greatest sagacity would be found to be of no avail, and therefore would be in no esteem. ”
Source: Gutenberg

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