Institutio Oratoria

Quintilian

Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.

There are some too who make questions of identity and difference come under the head of quality, others who place it under the head

v1-3 p.429

of definition. Posidonius [*](Fr. p. 232, Bake.) divides them into two classes, those concerned with words and those concerned with things. In the first case he thinks that the question is whether a word has any meaning; if so, what is its meaning, how many meanings has it, and how does it come to mean what it means? In the latter case, we employ conjecture, which he calls κατ᾽ αἴσθησιν, or inference from perception, quality, definition which he calls κατ᾽ ἔννοιαν, or rational inference, and relation. Hence also comes the division into things written and unwritten.

Even Cornelius Celsus stated that there were two general bases, one concerned with the question whether a thing is, the other with the question of what kind it is. He included definition under the first of these, because enquiry may equally be made as to whether sacrilege has been committed, when a man denies that he has stolen anything from a temple, and when he admits that he has stolen private money from a temple. He divides quality into fact and the letter of the law. Under the head of the letter of the law he places four classes, excluding questions of competence: [*](cp. § 23; translatio and exceptio are virtually identical. The four classes are Intention, Ambiguity, Contradictory Laws, Syllogism. ) quantity and intention he places under the head of conjecture. [*](i.e. the conjectural basis concerned with questions of fact. )