The Commens Dictionary

Quote from ‘The Proper Treatment of Hypotheses: a Preliminary Chapter, toward an Examination of Hume's Argument against Miracles, in its Logic and in its History’

… the classification of arguments is the chief business of the science of logic; so that every man who reasons (in the above sense) has necessarily a rudimentary science of logic, good or bad. The slang of the medieval universities called this his logica utens, - his “logic in possession”, - in contradistinction to logica docens, or the legitimate doctrine that is to be learned by study.