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Prudence is the knowledge of things to be sought, and those to be shunned.

"De Officiis". Treatise by Marcus Tullius Cicero, I. 43, as quoted in Hoyt's New Cyclopedia Of Practical Quotations (1922), p. 645-47, 44 B.C..
Prudence is the knowledge of things to be sought, and those to be shunned.