Institutio Oratoria

Quintilian

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

Further, the man who is to handle arguments correctly must know the nature and meaning of everything and their usual effects. For it is thus that we arrive at probable arguments or εἰκότα as the Greeks call them.

With regard to credibility there are three degrees. First, the highest, based on what usually happens, as for instance the assumption that children are loved by

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their parents. Secondly, there is the highly probable, as for instance the assumption that a man in the enjoyment of good health will probably live till to-morrow. The third degree is found where there is nothing absolutely against an assumption, such as that a theft committed in a house was the work of one of the household.